commit 4ca53cf34ee90a8d0e6de8ebaa5d005b93950a7e
Author: Heller <heller@nullptr.top>
Date:   Thu Jun 18 23:45:39 2026 +0000

    feat: добавил калькулятор на Jetpack Compose с Material 3
    
    Реализовал Android-приложение с ViewModel, базовой арифметикой и обработкой деления на ноль.

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7833135
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,20 @@
+*.iml
+.gradle
+/local.properties
+/.idea/
+.DS_Store
+/build
+/app/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+*.apk
+*.ap_
+*.aab
+*.dex
+*.class
+bin/
+gen/
+out/
+release/
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
new file mode 100644
index 0000000..106b113
--- /dev/null
+++ b/app/build.gradle.kts
@@ -0,0 +1,72 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
+}
+
+android {
+    namespace = "com.heller.calculator"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.heller.calculator"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+        vectorDrawables {
+            useSupportLibrary = true
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    buildFeatures {
+        compose = true
+    }
+
+    packaging {
+        resources {
+            excludes += "/META-INF/{AL2.0,LGPL2.1}"
+        }
+    }
+}
+
+dependencies {
+    val composeBom = platform("androidx.compose:compose-bom:2024.10.00")
+
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.6")
+    implementation("androidx.activity:activity-compose:1.9.3")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.6")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1")
+
+    implementation(composeBom)
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-graphics")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-extended")
+
+    debugImplementation("androidx.compose.ui:ui-tooling")
+    debugImplementation("androidx.compose.ui:ui-test-manifest")
+}
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..bc19667
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,3 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.kts.
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..e968527
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@drawable/ic_launcher"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.CalculatorCompose">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:theme="@style/Theme.CalculatorCompose">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
diff --git a/app/src/main/java/com/heller/calculator/CalculatorScreen.kt b/app/src/main/java/com/heller/calculator/CalculatorScreen.kt
new file mode 100644
index 0000000..97f0d34
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/CalculatorScreen.kt
@@ -0,0 +1,153 @@
+package com.heller.calculator
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
+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.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import com.heller.calculator.ui.components.CalculatorButton
+import com.heller.calculator.ui.components.CalculatorButtonType
+
+@Composable
+fun CalculatorScreen(viewModel: CalculatorViewModel) {
+    val uiState by viewModel.uiState.collectAsState()
+    val snackbarHostState = remember { SnackbarHostState() }
+
+    LaunchedEffect(uiState.error) {
+        uiState.error?.let { message ->
+            snackbarHostState.showSnackbar(message)
+        }
+    }
+
+    Scaffold(
+        snackbarHost = { SnackbarHost(snackbarHostState) },
+    ) { innerPadding ->
+        Surface(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(innerPadding),
+            color = MaterialTheme.colorScheme.background,
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(16.dp),
+                verticalArrangement = Arrangement.SpaceBetween,
+            ) {
+                DisplaySection(display = uiState.display)
+                ButtonGrid(viewModel = viewModel)
+            }
+        }
+    }
+}
+
+@Composable
+private fun DisplaySection(display: String) {
+    Column(
+        modifier = Modifier
+            .fillMaxWidth()
+            .padding(vertical = 24.dp),
+        horizontalAlignment = Alignment.End,
+    ) {
+        Text(
+            text = display,
+            style = MaterialTheme.typography.headlineLarge,
+            color = MaterialTheme.colorScheme.onBackground,
+            textAlign = TextAlign.End,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+            modifier = Modifier.fillMaxWidth(),
+        )
+    }
+}
+
+@Composable
+private fun ButtonGrid(viewModel: CalculatorViewModel) {
+    val rows = listOf(
+        listOf("C" to CalculatorButtonType.Clear, "÷" to CalculatorButtonType.Operator),
+        listOf("7" to CalculatorButtonType.Digit, "8" to CalculatorButtonType.Digit, "9" to CalculatorButtonType.Digit, "×" to CalculatorButtonType.Operator),
+        listOf("4" to CalculatorButtonType.Digit, "5" to CalculatorButtonType.Digit, "6" to CalculatorButtonType.Digit, "−" to CalculatorButtonType.Operator),
+        listOf("1" to CalculatorButtonType.Digit, "2" to CalculatorButtonType.Digit, "3" to CalculatorButtonType.Digit, "+" to CalculatorButtonType.Operator),
+        listOf("0" to CalculatorButtonType.Digit, "." to CalculatorButtonType.Digit, "=" to CalculatorButtonType.Equals),
+    )
+
+    Column(
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            CalculatorButton(
+                label = "C",
+                type = CalculatorButtonType.Clear,
+                onClick = { viewModel.onClear() },
+                modifier = Modifier
+                    .weight(1f)
+                    .aspectRatio(1f),
+            )
+            Spacer(modifier = Modifier.weight(2f))
+            CalculatorButton(
+                label = "÷",
+                type = CalculatorButtonType.Operator,
+                onClick = { viewModel.onOperation(CalculatorOperation.Divide) },
+                modifier = Modifier
+                    .weight(1f)
+                    .aspectRatio(1f),
+            )
+        }
+
+        rows.drop(1).forEach { row ->
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.spacedBy(12.dp),
+            ) {
+                row.forEach { (label, type) ->
+                    val weight = if (label == "0") 2f else 1f
+                    CalculatorButton(
+                        label = label,
+                        type = type,
+                        onClick = { handleButtonClick(label, viewModel) },
+                        modifier = Modifier
+                            .weight(weight)
+                            .aspectRatio(if (label == "0") 2.15f else 1f),
+                    )
+                }
+            }
+        }
+        Spacer(modifier = Modifier.height(8.dp))
+    }
+}
+
+private fun handleButtonClick(label: String, viewModel: CalculatorViewModel) {
+    when (label) {
+        "C" -> viewModel.onClear()
+        "=" -> viewModel.onEquals()
+        "." -> viewModel.onDecimalPoint()
+        "+" -> viewModel.onOperation(CalculatorOperation.Add)
+        "−" -> viewModel.onOperation(CalculatorOperation.Subtract)
+        "×" -> viewModel.onOperation(CalculatorOperation.Multiply)
+        "÷" -> viewModel.onOperation(CalculatorOperation.Divide)
+        else -> label.toIntOrNull()?.let { viewModel.onDigit(it) }
+    }
+}
diff --git a/app/src/main/java/com/heller/calculator/CalculatorState.kt b/app/src/main/java/com/heller/calculator/CalculatorState.kt
new file mode 100644
index 0000000..17de912
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/CalculatorState.kt
@@ -0,0 +1,20 @@
+package com.heller.calculator
+
+enum class CalculatorOperation(val symbol: String) {
+    Add("+"),
+    Subtract("-"),
+    Multiply("*"),
+    Divide("/");
+
+    fun apply(a: Double, b: Double): Double = when (this) {
+        Add -> a + b
+        Subtract -> a - b
+        Multiply -> a * b
+        Divide -> a / b
+    }
+}
+
+data class CalculatorUiState(
+    val display: String = "0",
+    val error: String? = null,
+)
diff --git a/app/src/main/java/com/heller/calculator/CalculatorViewModel.kt b/app/src/main/java/com/heller/calculator/CalculatorViewModel.kt
new file mode 100644
index 0000000..8048d8b
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/CalculatorViewModel.kt
@@ -0,0 +1,111 @@
+package com.heller.calculator
+
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import java.math.BigDecimal
+import java.math.RoundingMode
+
+class CalculatorViewModel : ViewModel() {
+
+    private var storedValue: Double? = null
+    private var pendingOperation: CalculatorOperation? = null
+    private var waitingForOperand = false
+
+    private val _uiState = MutableStateFlow(CalculatorUiState())
+    val uiState: StateFlow<CalculatorUiState> = _uiState.asStateFlow()
+
+    fun onDigit(digit: Int) {
+        clearErrorIfNeeded()
+        val current = if (waitingForOperand) {
+            waitingForOperand = false
+            ""
+        } else {
+            val display = _uiState.value.display
+            if (display == "0" && !display.contains(".")) "" else display
+        }
+
+        updateDisplay(current + digit.toString())
+    }
+
+    fun onDecimalPoint() {
+        clearErrorIfNeeded()
+        if (waitingForOperand) {
+            waitingForOperand = false
+            updateDisplay("0.")
+            return
+        }
+        if (!_uiState.value.display.contains(".")) {
+            updateDisplay(_uiState.value.display + ".")
+        }
+    }
+
+    fun onOperation(operation: CalculatorOperation) {
+        clearErrorIfNeeded()
+        val currentValue = _uiState.value.display.toDoubleOrNull() ?: return
+
+        if (storedValue != null && pendingOperation != null && !waitingForOperand) {
+            val result = compute(storedValue!!, pendingOperation!!, currentValue)
+            if (result == null) return
+            storedValue = result
+            updateDisplay(formatResult(result))
+        } else {
+            storedValue = currentValue
+        }
+
+        pendingOperation = operation
+        waitingForOperand = true
+    }
+
+    fun onEquals() {
+        clearErrorIfNeeded()
+        val operation = pendingOperation ?: return
+        val first = storedValue ?: return
+        val second = _uiState.value.display.toDoubleOrNull() ?: return
+
+        val result = compute(first, operation, second) ?: return
+        storedValue = null
+        pendingOperation = null
+        waitingForOperand = true
+        updateDisplay(formatResult(result))
+    }
+
+    fun onClear() {
+        storedValue = null
+        pendingOperation = null
+        waitingForOperand = false
+        _uiState.value = CalculatorUiState()
+    }
+
+    private fun compute(a: Double, operation: CalculatorOperation, b: Double): Double? {
+        if (operation == CalculatorOperation.Divide && b == 0.0) {
+            storedValue = null
+            pendingOperation = null
+            waitingForOperand = false
+            _uiState.value = CalculatorUiState(
+                display = "0",
+                error = "Cannot divide by zero",
+            )
+            return null
+        }
+
+        return operation.apply(a, b)
+    }
+
+    private fun formatResult(value: Double): String {
+        val bd = BigDecimal.valueOf(value).setScale(10, RoundingMode.HALF_UP).stripTrailingZeros()
+        return bd.toPlainString()
+    }
+
+    private fun clearErrorIfNeeded() {
+        _uiState.update { state ->
+            if (state.error != null) state.copy(error = null) else state
+        }
+    }
+
+    private fun updateDisplay(display: String) {
+        _uiState.update { it.copy(display = display) }
+    }
+}
diff --git a/app/src/main/java/com/heller/calculator/MainActivity.kt b/app/src/main/java/com/heller/calculator/MainActivity.kt
new file mode 100644
index 0000000..0eb9247
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/MainActivity.kt
@@ -0,0 +1,21 @@
+package com.heller.calculator
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.heller.calculator.ui.theme.CalculatorComposeTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        enableEdgeToEdge()
+        setContent {
+            CalculatorComposeTheme {
+                val viewModel: CalculatorViewModel = viewModel()
+                CalculatorScreen(viewModel = viewModel)
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/heller/calculator/ui/components/CalculatorButton.kt b/app/src/main/java/com/heller/calculator/ui/components/CalculatorButton.kt
new file mode 100644
index 0000000..af046ed
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/ui/components/CalculatorButton.kt
@@ -0,0 +1,65 @@
+package com.heller.calculator.ui.components
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+
+enum class CalculatorButtonType {
+    Digit,
+    Operator,
+    Equals,
+    Clear,
+}
+
+@Composable
+fun CalculatorButton(
+    label: String,
+    type: CalculatorButtonType,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val containerColor = when (type) {
+        CalculatorButtonType.Digit -> MaterialTheme.colorScheme.surfaceVariant
+        CalculatorButtonType.Operator -> MaterialTheme.colorScheme.primaryContainer
+        CalculatorButtonType.Equals -> MaterialTheme.colorScheme.primary
+        CalculatorButtonType.Clear -> MaterialTheme.colorScheme.errorContainer
+    }
+
+    val contentColor = when (type) {
+        CalculatorButtonType.Digit -> MaterialTheme.colorScheme.onSurfaceVariant
+        CalculatorButtonType.Operator -> MaterialTheme.colorScheme.onPrimaryContainer
+        CalculatorButtonType.Equals -> MaterialTheme.colorScheme.onPrimary
+        CalculatorButtonType.Clear -> MaterialTheme.colorScheme.onErrorContainer
+    }
+
+    Button(
+        onClick = onClick,
+        modifier = modifier,
+        shape = RoundedCornerShape(24.dp),
+        colors = ButtonDefaults.buttonColors(
+            containerColor = containerColor,
+            contentColor = contentColor,
+        ),
+        elevation = ButtonDefaults.buttonElevation(defaultElevation = 2.dp),
+    ) {
+        Box(
+            modifier = Modifier.fillMaxSize(),
+            contentAlignment = Alignment.Center,
+        ) {
+            Text(
+                text = label,
+                fontSize = 24.sp,
+                style = MaterialTheme.typography.bodyLarge,
+            )
+        }
+    }
+}
diff --git a/app/src/main/java/com/heller/calculator/ui/theme/Color.kt b/app/src/main/java/com/heller/calculator/ui/theme/Color.kt
new file mode 100644
index 0000000..7c6d4ef
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/ui/theme/Color.kt
@@ -0,0 +1,11 @@
+package com.heller.calculator.ui.theme
+
+import androidx.compose.ui.graphics.Color
+
+val Purple80 = Color(0xFFD0BCFF)
+val PurpleGrey80 = Color(0xFFCCC2DC)
+val Pink80 = Color(0xFFEFB8C8)
+
+val Purple40 = Color(0xFF6750A4)
+val PurpleGrey40 = Color(0xFF625B71)
+val Pink40 = Color(0xFF7D5260)
diff --git a/app/src/main/java/com/heller/calculator/ui/theme/Theme.kt b/app/src/main/java/com/heller/calculator/ui/theme/Theme.kt
new file mode 100644
index 0000000..ba91510
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/ui/theme/Theme.kt
@@ -0,0 +1,60 @@
+package com.heller.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.runtime.SideEffect
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalView
+import androidx.core.view.WindowCompat
+
+private val DarkColorScheme = darkColorScheme(
+    primary = Purple80,
+    secondary = PurpleGrey80,
+    tertiary = Pink80,
+)
+
+private val LightColorScheme = lightColorScheme(
+    primary = Purple40,
+    secondary = PurpleGrey40,
+    tertiary = Pink40,
+)
+
+@Composable
+fun CalculatorComposeTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    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
+    }
+
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            window.statusBarColor = colorScheme.surface.toArgb()
+            WindowCompat.getInsetsController(window, view).isAppearanceLightStatusBars = !darkTheme
+        }
+    }
+
+    MaterialTheme(
+        colorScheme = colorScheme,
+        typography = Typography,
+        content = content,
+    )
+}
diff --git a/app/src/main/java/com/heller/calculator/ui/theme/Type.kt b/app/src/main/java/com/heller/calculator/ui/theme/Type.kt
new file mode 100644
index 0000000..e9179cf
--- /dev/null
+++ b/app/src/main/java/com/heller/calculator/ui/theme/Type.kt
@@ -0,0 +1,24 @@
+package com.heller.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
+
+val Typography = Typography(
+    bodyLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Normal,
+        fontSize = 16.sp,
+        lineHeight = 24.sp,
+        letterSpacing = 0.5.sp,
+    ),
+    headlineLarge = TextStyle(
+        fontFamily = FontFamily.Default,
+        fontWeight = FontWeight.Light,
+        fontSize = 48.sp,
+        lineHeight = 56.sp,
+        letterSpacing = 0.sp,
+    ),
+)
diff --git a/app/src/main/res/drawable/ic_launcher.xml b/app/src/main/res/drawable/ic_launcher.xml
new file mode 100644
index 0000000..a365abf
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="48"
+    android:viewportHeight="48">
+    <path
+        android:fillColor="#6750A4"
+        android:pathData="M0,0h48v48h-48z" />
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M14,12h6v24h-6zM28,12h6v24h-6zM14,22h20v4h-20z" />
+</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..6d9618c
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@@ -0,0 +1,12 @@
+<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="#6750A4"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M32,28h12v52h-12zM64,28h12v52h-12zM32,48h44v12h-44z" />
+</vector>
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..a8a8fa5
--- /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>
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..a8a8fa5
--- /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>
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..8f0f342
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#6750A4</color>
+</resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..91b584c
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Calculator</string>
+</resources>
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..27a2e38
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.CalculatorCompose" parent="android:Theme.Material.Light.NoActionBar" />
+</resources>
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..6ff92dd
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,5 @@
+plugins {
+    id("com.android.application") version "8.5.2" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.21" apply false
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..f0a2e55
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,4 @@
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+android.useAndroidX=true
+kotlin.code.style=official
+android.nonTransitiveRClass=true
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e644113
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..b82aa23
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..97de990
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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 POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | 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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..16e26a1
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,92 @@
+@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=.
+@rem This is normally unused
+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=-Dfile.encoding=UTF-8 "-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% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+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% equ 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!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..b426937
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,18 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "CalculatorCompose"
+include(":app")