initial commit

58 files changed, 1698 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aa724b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..b86273d
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/deploymentTargetSelector.xml b/.idea/deploymentTargetSelector.xml
new file mode 100644
index 0000000..b268ef3
--- /dev/null
+++ b/.idea/deploymentTargetSelector.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
new file mode 100644
index 0000000..7b3006b
--- /dev/null
+++ b/.idea/gradle.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+        <option name="resolveExternalAnnotations" value="false" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 0000000..cde3e19
--- /dev/null
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,57 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="ComposePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="ComposePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewDimensionRespectsLimit" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewMustBeTopLevelFunction" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewNeedsComposableAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="GlancePreviewNotSupportedInUnitTestFiles" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewAnnotationInFunctionWithParameters" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewApiLevelMustBeValid" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewDeviceShouldUseNewSpec" enabled="true" level="WEAK WARNING" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewFontScaleMustBeGreaterThanZero" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewMultipleParameterProviders" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+    <inspection_tool class="PreviewPickerAnnotation" enabled="true" level="ERROR" enabled_by_default="true">
+      <option name="composableFile" value="true" />
+      <option name="previewFile" value="true" />
+    </inspection_tool>
+  </profile>
+</component>
\ No newline at end of file
diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
new file mode 100644
index 0000000..6d0ee1c
--- /dev/null
+++ b/.idea/kotlinc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="KotlinJpsPluginSettings">
+    <option name="version" value="2.0.0" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/migrations.xml b/.idea/migrations.xml
new file mode 100644
index 0000000..f8051a6
--- /dev/null
+++ b/.idea/migrations.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectMigrations">
+    <option name="MigrateToGradleLocalJavaHome">
+      <set>
+        <option value="$PROJECT_DIR$" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..74dd639
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
new file mode 100644
index 0000000..16660f1
--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/app/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
new file mode 100644
index 0000000..6848831
--- /dev/null
+++ b/app/build.gradle.kts
@@ -0,0 +1,60 @@
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+}
+
+android {
+    namespace = "com.a404m.calculator"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.a404m.calculator"
+        minSdk = 21
+        targetSdk = 35
+        versionCode = 2
+        versionName = "0.1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+    buildFeatures {
+        compose = true
+    }
+}
+
+dependencies {
+
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.androidx.junit)
+    androidTestImplementation(libs.androidx.espresso.core)
+    androidTestImplementation(platform(libs.androidx.compose.bom))
+    androidTestImplementation(libs.androidx.ui.test.junit4)
+    debugImplementation(libs.androidx.ui.tooling)
+    debugImplementation(libs.androidx.ui.test.manifest)
+}
\ No newline at end of file
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/app/release/app-release.apk b/app/release/app-release.apk
new file mode 100644
index 0000000..4763c61
--- /dev/null
+++ b/app/release/app-release.apk
diff --git a/app/release/baselineProfiles/0/app-release.dm b/app/release/baselineProfiles/0/app-release.dm
new file mode 100644
index 0000000..2df2b65
--- /dev/null
+++ b/app/release/baselineProfiles/0/app-release.dm
diff --git a/app/release/baselineProfiles/1/app-release.dm b/app/release/baselineProfiles/1/app-release.dm
new file mode 100644
index 0000000..829ee1a
--- /dev/null
+++ b/app/release/baselineProfiles/1/app-release.dm
diff --git a/app/release/output-metadata.json b/app/release/output-metadata.json
new file mode 100644
index 0000000..4b3565e
--- /dev/null
+++ b/app/release/output-metadata.json
@@ -0,0 +1,37 @@
+{
+  "version": 3,
+  "artifactType": {
+    "type": "APK",
+    "kind": "Directory"
+  },
+  "applicationId": "com.a404m.calculator",
+  "variantName": "release",
+  "elements": [
+    {
+      "type": "SINGLE",
+      "filters": [],
+      "attributes": [],
+      "versionCode": 2,
+      "versionName": "0.1.0",
+      "outputFile": "app-release.apk"
+    }
+  ],
+  "elementType": "File",
+  "baselineProfiles": [
+    {
+      "minApi": 28,
+      "maxApi": 30,
+      "baselineProfiles": [
+        "baselineProfiles/1/app-release.dm"
+      ]
+    },
+    {
+      "minApi": 31,
+      "maxApi": 2147483647,
+      "baselineProfiles": [
+        "baselineProfiles/0/app-release.dm"
+      ]
+    }
+  ],
+  "minSdkVersionForDexing": 21
+}
\ No newline at end of file
diff --git a/app/src/androidTest/java/com/a404m/calculator/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/a404m/calculator/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..785fe9a
--- /dev/null
+++ b/app/src/androidTest/java/com/a404m/calculator/ExampleInstrumentedTest.kt
@@ -0,0 +1,27 @@
+package com.a404m.calculator
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals(
+            "com.a404m.calculator",
+            appContext.packageName
+        )
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..8d7bca4
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Calculator"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.Calculator">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/app/src/main/ic_launcher-playstore.png b/app/src/main/ic_launcher-playstore.png
new file mode 100644
index 0000000..2d94637
--- /dev/null
+++ b/app/src/main/ic_launcher-playstore.png
diff --git a/app/src/main/java/com/a404m/calculator/MainActivity.kt b/app/src/main/java/com/a404m/calculator/MainActivity.kt
new file mode 100644
index 0000000..9a40e9b
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/MainActivity.kt
@@ -0,0 +1,27 @@
+package com.a404m.calculator
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import com.a404m.calculator.ui.page.HomePage
+import com.a404m.calculator.ui.theme.CalculatorTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContent {
+            CalculatorTheme {
+                HomePage()
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/MathHelper.kt b/app/src/main/java/com/a404m/calculator/MathHelper.kt
new file mode 100644
index 0000000..fa6cfc7
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/MathHelper.kt
@@ -0,0 +1,309 @@
+package com.a404m.calculator
+
+import android.util.Log
+import com.a404m.calculator.MathHelper.Operator.Kind
+import java.nio.charset.UnsupportedCharsetException
+
+object MathHelper {
+    private val operatorStrings = arrayOf(
+        '+',
+        '-',
+        '×',
+        '÷',
+        '%',
+    )
+    private val numberStrings = arrayOf(
+        '0',
+        '1',
+        '2',
+        '3',
+        '4',
+        '5',
+        '6',
+        '7',
+        '8',
+        '9',
+        '.',
+    )
+
+    private val plus = Operator(
+        '+',
+        Kind.PREFIX,
+        {
+            Operand(it.first().value)
+        }
+    )
+    private val minus = Operator(
+        '-',
+        Kind.PREFIX,
+        {
+            Operand(-it.first().value)
+        }
+    )
+    private val add = Operator(
+        '+',
+        Kind.INFIX,
+        {
+            Operand(it.first().value+it.last().value)
+        }
+    )
+    private val sub = Operator(
+        '-',
+        Kind.INFIX,
+        {
+            Operand(it.first().value-it.last().value)
+        }
+    )
+    private val mul = Operator(
+        '×',
+        Kind.INFIX,
+        {
+            Operand(it.first().value*it.last().value)
+        }
+    )
+    private val div = Operator(
+        '÷',
+        Kind.INFIX,
+        {
+            Operand(it.first().value/it.last().value)
+        }
+    )
+    private val rem = Operator(
+        '%',
+        Kind.INFIX,
+        {
+            Operand(it.first().value%it.last().value)
+        }
+    )
+    private val operatorOrders = arrayOf(
+        arrayOf(
+            plus,
+            minus,
+        ),
+        arrayOf(
+            mul,
+            div,
+            rem,
+        ),
+        arrayOf(
+            add,
+            sub,
+        )
+    )
+    private val operators = arrayOf(
+        plus,
+        minus,
+        add,
+        sub,
+        mul,
+        div,
+        rem,
+    )
+
+    fun eval(expression: String): String {
+        return try {
+            parse(lex(expression)).eval().toString()
+        } catch (e: Exception) {
+            e.message ?: "Exception"
+        }
+    }
+
+    private fun parse(lexed: ArrayList<Any>): Operator {
+        for (order in operatorOrders) {
+            if (lexed.size == 1) {
+                break
+            }
+            for (i in lexed.indices) {
+                val item = lexed[i]
+                if (item is BasicOperator) {
+                    var op = item.toOperator(
+                        lexed,
+                        i
+                    )
+                    if (op in order) {
+                        op = op.cloneWithoutOperands()
+                        Log.d(
+                            "A404M",
+                            "parse: $op"
+                        )
+                        lexed[i] = op
+                        when (op.kind) {
+                            Kind.NONE -> {}
+                            Kind.INFIX -> {
+                                op.operands.add(lexed.removeAt(i - 1))
+                                op.operands.add(lexed.removeAt(i))
+                            }
+
+                            Kind.PREFIX -> {
+                                op.operands.add(lexed.removeAt(i + 1))
+                            }
+
+                            Kind.POSTFIX -> {
+                                op.operands.add(lexed.removeAt(i - 1))
+                            }
+                        }
+                        break
+                    }
+                }
+            }
+        }
+        return if (lexed.size != 1) {
+            throw UnsupportedOperationException("lexed.size = ${lexed.size}: $lexed")
+        } else if (lexed.first() is Operator) {
+            lexed.first() as Operator
+        } else if (lexed.first() is Operand) {
+            plus.cloneWithoutOperands().cloneWithOperator(arrayListOf(lexed.first()))
+        } else {
+            throw UnsupportedOperationException("unsupported type ${lexed.first().javaClass}")
+        }
+    }
+
+    private fun lex(expression: String): ArrayList<Any> {
+        val items = arrayListOf<Any>()
+
+        var i = 0
+        while (i < expression.length) {
+            when (val c = expression[i]) {
+                in numberStrings -> {
+                    val start = i
+                    while (++i < expression.length && expression[i] in numberStrings);
+                    items.add(
+                        Operand(
+                            value = expression.substring(
+                                start,
+                                i
+                            ).toDouble()
+                        )
+                    )
+                    --i
+                }
+
+                in operatorStrings -> {
+                    items.add(
+                        BasicOperator(c)
+                    )
+                }
+
+                else -> throw UnsupportedCharsetException(c.toString())
+            }
+            ++i
+        }
+
+        return items
+    }
+
+    private class Operator(
+        val operator: Char,
+        val kind: Kind,
+        val operate: (operands:List<Operand>)->Operand,
+        val operands: ArrayList<Any> = arrayListOf(),
+    ) {
+        fun cloneWithoutOperands():Operator{
+            return Operator(
+                operator,
+                kind,
+                operate,
+            )
+        }
+
+        fun cloneWithOperator(operands: ArrayList<Any>): Operator {
+            return Operator(
+                operator,
+                kind,
+                operate,
+                operands,
+            )
+        }
+
+        fun eval(): Operand {
+            Log.d(
+                "A404M",
+                "eval: $operator $operands"
+            )
+            if(operandSize() != operands.size){
+                throw UnsupportedOperationException("Not enough operands")
+            }
+
+            val evaledOperands = operands.map {
+                if(it is Operator){
+                    it.eval()
+                }else{
+                    it as Operand
+                }
+            }
+
+            return operate(evaledOperands)
+        }
+
+        fun operandSize(): Int {
+            return when (kind) {
+                Kind.INFIX -> 2
+                Kind.PREFIX, Kind.POSTFIX -> 1
+                Kind.NONE -> 0
+            }
+        }
+
+        override fun toString(): String {
+            return "$operator $kind $operands"
+        }
+
+        enum class Kind {
+            NONE,
+            INFIX,
+            PREFIX,
+            POSTFIX,
+        }
+    }
+
+    private class BasicOperator(
+        val operator: Char,
+    ) {
+        fun toOperator(
+            items: List<Any>,
+            i: Int
+        ): Operator {
+            val left = items.getOrElse(
+                i - 1,
+                { Any() },
+            ) is Operand
+
+            val right = items.getOrElse(
+                i + 1,
+                { Any() },
+            ) is Operand
+
+            val k:Kind
+
+            if (left) {
+                if (right) {
+                    k = Kind.INFIX
+                } else {
+                    k = Kind.POSTFIX
+                }
+            } else if (right) {
+                k = Kind.PREFIX
+            } else {
+                k = Kind.NONE
+            }
+
+            return operators.first {
+                it.operator == operator && it.kind == k
+            }
+        }
+
+        override fun toString(): String {
+            return operator.toString();
+        }
+    }
+
+    private class Operand(
+        val value: Double,
+    ){
+        override fun toString(): String {
+            if(value % 1 == 0.0){
+                return "%.0f".format(value)
+            }
+            return value.toString()
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/model/CalcButtonModel.kt b/app/src/main/java/com/a404m/calculator/model/CalcButtonModel.kt
new file mode 100644
index 0000000..435acef
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/model/CalcButtonModel.kt
@@ -0,0 +1,139 @@
+package com.a404m.calculator.model
+
+import com.a404m.calculator.MathHelper
+
+data class CalcButtonModel(
+    val text: String,
+    val weight:Float = 1F,
+    val op: (expression: String) -> String,
+) {
+    companion object {
+        val K_0 = CalcButtonModel(
+            text = "0",
+            op = {
+                it + '0'
+            }
+        )
+        val K_1 = CalcButtonModel(
+            text = "1",
+            op = {
+                it + '1'
+            }
+        )
+        val K_2 = CalcButtonModel(
+            text = "2",
+            op = {
+                it + '2'
+            }
+        )
+        val K_3 = CalcButtonModel(
+            text = "3",
+            op = {
+                it + '3'
+            }
+        )
+        val K_4 = CalcButtonModel(
+            text = "4",
+            op = {
+                it + '4'
+            }
+        )
+        val K_5 = CalcButtonModel(
+            text = "5",
+            op = {
+                it + '5'
+            }
+        )
+        val K_6 = CalcButtonModel(
+            text = "6",
+            op = {
+                it + '6'
+            }
+        )
+        val K_7 = CalcButtonModel(
+            text = "7",
+            op = {
+                it + '7'
+            }
+        )
+        val K_8 = CalcButtonModel(
+            text = "8",
+            op = {
+                it + '8'
+            }
+        )
+        val K_9 = CalcButtonModel(
+            text = "9",
+            op = {
+                it + '9'
+            }
+        )
+        val K_PLUS = CalcButtonModel(
+            text = "+",
+            op = {
+                it + '+'
+            }
+        )
+        val K_MINUS = CalcButtonModel(
+            text = "-",
+            op = {
+                it + '-'
+            }
+        )
+        val K_MULTIPLY = CalcButtonModel(
+            text = "×",
+            op = {
+                it + '×'
+            }
+        )
+        val K_DIVISION = CalcButtonModel(
+            text = "÷",
+            op = {
+                it + '÷'
+            }
+        )
+        val K_REMINDER = CalcButtonModel(
+            text = "%",
+            op = {
+                it + '%'
+            }
+        )
+        val K_EQUAL = CalcButtonModel(
+            text = "=",
+            op = {
+                MathHelper.eval(it)
+            }
+        )
+        val K_DOT = CalcButtonModel(
+            text = ".",
+            op = {
+                it + '.'
+            }
+        )
+        val K_C = CalcButtonModel(
+            text = "C",
+            op = {
+                ""
+            }
+        )
+        val K_BACKSPACE = CalcButtonModel(
+            text = "⌫",
+            op = {
+                if (it.length <= 1) {
+                    ""
+                } else {
+                    it.substring(
+                        0,
+                        it.length - 1,
+                    )
+                }
+            }
+        )
+        val K_SWITCH_MODE = CalcButtonModel(
+            text = "\u2026",
+            op = {
+                it
+            }
+        )
+    }
+}
diff --git a/app/src/main/java/com/a404m/calculator/ui/page/Home.kt b/app/src/main/java/com/a404m/calculator/ui/page/Home.kt
new file mode 100644
index 0000000..ba9a21e
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/ui/page/Home.kt
@@ -0,0 +1,120 @@
+package com.a404m.calculator.ui.page
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.contentColorFor
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import com.a404m.calculator.model.CalcButtonModel
+import com.a404m.calculator.ui.theme.CalculatorTheme
+import com.a404m.calculator.ui.util.CalcGrid
+
+@Composable
+fun HomePage(modifier: Modifier = Modifier) {
+    var expression by rememberSaveable {
+        mutableStateOf("")
+    }
+    Scaffold(
+        modifier = modifier,
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .padding(paddingValues)
+                .fillMaxSize(),
+            verticalArrangement = Arrangement.Bottom,
+        ) {
+            Text(
+                modifier = Modifier.padding(8.dp).fillMaxWidth(),
+                text = expression,
+                style = MaterialTheme.typography.titleLarge,
+                textAlign = TextAlign.Right,
+                fontSize = 35.sp,
+            )
+            HorizontalDivider(modifier = Modifier.padding(horizontal = 4.dp))
+            CalcGrid(
+                modifier = Modifier
+                    .padding(4.dp),
+                columns = 4,
+                items = arrayOf(
+                    CalcButtonModel.K_C,
+                    CalcButtonModel.K_BACKSPACE,
+                    CalcButtonModel.K_REMINDER,
+                    CalcButtonModel.K_DIVISION,
+                    CalcButtonModel.K_7,
+                    CalcButtonModel.K_8,
+                    CalcButtonModel.K_9,
+                    CalcButtonModel.K_MULTIPLY,
+                    CalcButtonModel.K_4,
+                    CalcButtonModel.K_5,
+                    CalcButtonModel.K_6,
+                    CalcButtonModel.K_MINUS,
+                    CalcButtonModel.K_1,
+                    CalcButtonModel.K_2,
+                    CalcButtonModel.K_3,
+                    CalcButtonModel.K_PLUS,
+                    CalcButtonModel.K_0,
+                    CalcButtonModel.K_DOT,
+                    CalcButtonModel.K_SWITCH_MODE,
+                    CalcButtonModel.K_EQUAL,
+                ),
+            ) {
+                val backColor = MaterialTheme.colorScheme.primary
+                Box(
+                    modifier = Modifier
+                        .padding(4.dp)
+                        .height(70.dp)
+                        .weight(it.weight)
+                        .clip(
+                            shape = RoundedCornerShape(10.dp),
+                        )
+                        .background(
+                            color = backColor,
+                            shape = RoundedCornerShape(10.dp),
+                        )
+                        .clickable {
+                            expression = it.op(expression)
+                        },
+                    contentAlignment = Alignment.Center,
+                ) {
+                    Text(
+                        text = it.text,
+                        style = MaterialTheme.typography.titleLarge,
+                        color = MaterialTheme.colorScheme.contentColorFor(backColor)
+                    )
+                }
+            }
+        }
+    }
+}
+
+@Preview
+@Composable
+private fun HomePagePreview() {
+    CalculatorTheme {
+        HomePage(
+            modifier = Modifier.fillMaxSize(),
+        )
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/ui/theme/Color.kt b/app/src/main/java/com/a404m/calculator/ui/theme/Color.kt
new file mode 100644
index 0000000..6a4fd22
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/ui/theme/Color.kt
@@ -0,0 +1,11 @@
+package com.a404m.calculator.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+val Purple80 = Color(0xFFD0BCFF)
+val PurpleGrey80 = Color(0xFFCCC2DC)
+val Pink80 = Color(0xFFEFB8C8)
+
+val Purple40 = Color(0xFF6650a4)
+val PurpleGrey40 = Color(0xFF625b71)
+val Pink40 = Color(0xFF7D5260)
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/ui/theme/Theme.kt b/app/src/main/java/com/a404m/calculator/ui/theme/Theme.kt
new file mode 100644
index 0000000..20d6120
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/ui/theme/Theme.kt
@@ -0,0 +1,58 @@
+package com.a404m.calculator.ui.theme
+
+import android.app.Activity
+import android.os.Build
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+
+private val DarkColorScheme = darkColorScheme(
+    primary = Purple80,
+    secondary = PurpleGrey80,
+    tertiary = Pink80
+)
+
+private val LightColorScheme = lightColorScheme(
+    primary = Purple40,
+    secondary = PurpleGrey40,
+    tertiary = Pink40
+
+    /* Other default colors to override
+    background = Color(0xFFFFFBFE),
+    surface = Color(0xFFFFFBFE),
+    onPrimary = Color.White,
+    onSecondary = Color.White,
+    onTertiary = Color.White,
+    onBackground = Color(0xFF1C1B1F),
+    onSurface = Color(0xFF1C1B1F),
+    */
+)
+
+@Composable
+fun CalculatorTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    // Dynamic color is available on Android 12+
+    dynamicColor: Boolean = true,
+    content: @Composable () -> Unit
+) {
+    val colorScheme = when {
+        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+            val context = LocalContext.current
+            if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
+        }
+
+        darkTheme -> DarkColorScheme
+        else -> LightColorScheme
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = Typography,
+        content = content
+    )
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/ui/theme/Type.kt b/app/src/main/java/com/a404m/calculator/ui/theme/Type.kt
new file mode 100644
index 0000000..42ec494
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/ui/theme/Type.kt
@@ -0,0 +1,34 @@
+package com.a404m.calculator.ui.theme
+
+import androidx.compose.material3.Typography
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+
+// Set of Material typography styles to start with
+val Typography = Typography(
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp
+    )
+    /* Other default text styles to override
+    titleLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 22.sp,
+        lineHeight = 28.sp,
+        letterSpacing = 0.sp
+    ),
+    labelSmall = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Medium,
+        fontSize = 11.sp,
+        lineHeight = 16.sp,
+        letterSpacing = 0.5.sp
+    )
+    */
+)
\ No newline at end of file
diff --git a/app/src/main/java/com/a404m/calculator/ui/util/Container.kt b/app/src/main/java/com/a404m/calculator/ui/util/Container.kt
new file mode 100644
index 0000000..ba27afe
--- /dev/null
+++ b/app/src/main/java/com/a404m/calculator/ui/util/Container.kt
@@ -0,0 +1,31 @@
+package com.a404m.calculator.ui.util
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+
+@Composable
+fun <T> CalcGrid(
+    modifier: Modifier = Modifier,
+    columns: Int,
+    items: Array<T>,
+    builder: @Composable (T) -> Unit,
+) {
+    Column(
+        modifier = modifier,
+    ) {
+        var index = 0
+        while (index != items.size) {
+            Row {
+                for (j in 0 until columns) {
+                    if(index == items.size){
+                        break
+                    }
+                    builder(items[index])
+                    ++index
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..07d5da9
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>
diff --git a/app/src/main/res/drawable/ic_launcher_foreground.xml b/app/src/main/res/drawable/ic_launcher_foreground.xml
new file mode 100644
index 0000000..c5eec94
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="87"
+    android:viewportHeight="167.625">
+  <group android:scaleX="0.23874721"
+      android:scaleY="0.46"
+      android:translateX="33.1145"
+      android:translateY="45.25875">
+    <group android:translateY="133.66406">
+      <path android:pathData="M6.1875,-36.84375L80.515625,-36.84375L80.515625,-24.75L6.1875,-24.75L6.1875,-36.84375ZM6.1875,-65.390625L80.515625,-65.390625L80.515625,-53.4375L6.1875,-53.4375L6.1875,-65.390625Z"
+          android:fillColor="#A437DB"/>
+    </group>
+  </group>
+</vector>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..7353dbd
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..7353dbd
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.webp b/app/src/main/res/mipmap-hdpi/ic_launcher.webp
new file mode 100644
index 0000000..ee62035
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.webp
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..6452b49
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.webp b/app/src/main/res/mipmap-mdpi/ic_launcher.webp
new file mode 100644
index 0000000..8f60d53
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher.webp
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..3cd3848
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
new file mode 100644
index 0000000..9cb323b
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..6941df4
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..eb514e1
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..749d7c1
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..e404ad0
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..f7f408b
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..f8c6127
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/ic_launcher_background.xml b/app/src/main/res/values/ic_launcher_background.xml
new file mode 100644
index 0000000..3376515
--- /dev/null
+++ b/app/src/main/res/values/ic_launcher_background.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#35185A</color>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..665ca8d
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Calculator</string>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..f244678
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <style name="Theme.Calculator" parent="android:Theme.Material.Light.NoActionBar" />
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
new file mode 100644
index 0000000..fa0f996
--- /dev/null
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older that API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>
\ No newline at end of file
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
new file mode 100644
index 0000000..9ee9997
--- /dev/null
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>
\ No newline at end of file
diff --git a/app/src/test/java/com/a404m/calculator/ExampleUnitTest.kt b/app/src/test/java/com/a404m/calculator/ExampleUnitTest.kt
new file mode 100644
index 0000000..4e8caf3
--- /dev/null
+++ b/app/src/test/java/com/a404m/calculator/ExampleUnitTest.kt
@@ -0,0 +1,20 @@
+package com.a404m.calculator
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(
+            4,
+            2 + 2
+        )
+    }
+}
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..952b930
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,6 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.android) apply false
+    alias(libs.plugins.kotlin.compose) apply false
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..20e2a01
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,23 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. For more details, visit
+# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true
\ No newline at end of file
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
new file mode 100644
index 0000000..8fb3aa8
--- /dev/null
+++ b/gradle/libs.versions.toml
@@ -0,0 +1,32 @@
+[versions]
+agp = "8.7.2"
+kotlin = "2.0.0"
+coreKtx = "1.15.0"
+junit = "4.13.2"
+junitVersion = "1.2.1"
+espressoCore = "3.6.1"
+lifecycleRuntimeKtx = "2.8.7"
+activityCompose = "1.9.3"
+composeBom = "2024.04.01"
+
+[libraries]
+androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
+androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntimeKtx" }
+androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
+androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
+androidx-ui = { group = "androidx.compose.ui", name = "ui" }
+androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
+androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
+androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
+androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest" }
+androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4" }
+androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
+
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..1fb2651
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Tue Dec 17 03:59:24 IRST 2024
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..4f906e0
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..ac1b06f
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem

+@rem Copyright 2015 the original author or authors.

+@rem

+@rem Licensed under the Apache License, Version 2.0 (the "License");

+@rem you may not use this file except in compliance with the License.

+@rem You may obtain a copy of the License at

+@rem

+@rem      https://www.apache.org/licenses/LICENSE-2.0

+@rem

+@rem Unless required by applicable law or agreed to in writing, software

+@rem distributed under the License is distributed on an "AS IS" BASIS,

+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+@rem See the License for the specific language governing permissions and

+@rem limitations under the License.

+@rem

+

+@if "%DEBUG%" == "" @echo off

+@rem ##########################################################################

+@rem

+@rem  Gradle startup script for Windows

+@rem

+@rem ##########################################################################

+

+@rem Set local scope for the variables with windows NT shell

+if "%OS%"=="Windows_NT" setlocal

+

+set DIRNAME=%~dp0

+if "%DIRNAME%" == "" set DIRNAME=.

+set APP_BASE_NAME=%~n0

+set APP_HOME=%DIRNAME%

+

+@rem Resolve any "." and ".." in APP_HOME to make it shorter.

+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi

+

+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.

+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

+

+@rem Find java.exe

+if defined JAVA_HOME goto findJavaFromJavaHome

+

+set JAVA_EXE=java.exe

+%JAVA_EXE% -version >NUL 2>&1

+if "%ERRORLEVEL%" == "0" goto execute

+

+echo.

+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:findJavaFromJavaHome

+set JAVA_HOME=%JAVA_HOME:"=%

+set JAVA_EXE=%JAVA_HOME%/bin/java.exe

+

+if exist "%JAVA_EXE%" goto execute

+

+echo.

+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:execute

+@rem Setup the command line

+

+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar

+

+

+@rem Execute Gradle

+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*

+

+:end

+@rem End local scope for the variables with windows NT shell

+if "%ERRORLEVEL%"=="0" goto mainEnd

+

+:fail

+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of

+rem the _cmd.exe /c_ return code!

+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1

+exit /b 1

+

+:mainEnd

+if "%OS%"=="Windows_NT" endlocal

+

+:omega

diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..bdb5011
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,24 @@
+pluginManagement {
+    repositories {
+        google {
+            content {
+                includeGroupByRegex("com\\.android.*")
+                includeGroupByRegex("com\\.google.*")
+                includeGroupByRegex("androidx.*")
+            }
+        }
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "Calculator"
+include(":app")
+ 
\ No newline at end of file