compose 계산기

	class MainActivity : ComponentActivity() {
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContent {
	DefaultTheme {
	// A surface container using the 'background' color from the theme
	Surface(
	modifier = Modifier.fillMaxSize(),
	color = MaterialTheme.colorScheme.background
	) {
	CalculatorApp()
	}
	}
	}
	}
	}
	@SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
	@OptIn(ExperimentalMaterial3Api::class)
	@Composable
	fun CalculatorApp() {
	var num1 by remember { mutableStateOf("") }
	var num2 by remember { mutableStateOf("") }
	var result by remember { mutableStateOf("") }
	Scaffold(
	topBar = {
	TopAppBar(
	title = {
	Text(text = "계산기 만들어봐용")
	}
	)
	},
	content = {
	Column(
	modifier = Modifier.fillMaxSize(),
	verticalArrangement = Arrangement.Center,
	horizontalAlignment = Alignment.CenterHorizontally
	) {
	TextField(
	value = num1,
	onValueChange = { num1 = it },
	label = { Text(text = "숫자 1") },
	modifier = Modifier.padding(16.dp)
	)
	TextField(
	value = num2,
	onValueChange = { num2 = it },
	label = { Text(text = "숫자 2") },
	modifier = Modifier.padding(16.dp)
	)
	Spacer(modifier = Modifier.height(16.dp))
	Button(
	onClick = {
	val n1 = num1.toIntOrNull()
	val n2 = num2.toIntOrNull()
	if (n1 != null && n2 != null) {
	result = (n1 + n2).toString()
	} else {
	result = "Invalid input"
	}
	},
	modifier = Modifier.padding(16.dp)
	) {
	Text(text = "더하기")
	}
	Button(
	onClick = {
	val n1 = num1.toIntOrNull()
	val n2 = num2.toIntOrNull()
	if (n1 != null && n2 != null) {
	result = (n1 - n2).toString()
	} else {
	result = "Invalid input"
	}
	},
	modifier = Modifier.padding(16.dp)
	) {
	Text(text = "빼기")
	}
	Button(
	onClick = {
	val n1 = num1.toIntOrNull()
	val n2 = num2.toIntOrNull()
	if (n1 != null && n2 != null) {
	result = (n1 * n2).toString()
	} else {
	result = "Invalid input"
	}
	},
	modifier = Modifier.padding(16.dp)
	) {
	Text(text = "곱하기")
	}
	Button(
	onClick = {
	val n1 = num1.toIntOrNull()
	val n2 = num2.toIntOrNull()
	if (n1 != null && n2 != null) {
	result = (n1 / n2).toString()
	} else {
	result = "Invalid input"
	}
	},
	modifier = Modifier.padding(16.dp)
	) {
	Text(text = "나누기")
	}
	Text(
	text = "결과: $result",
	style = MaterialTheme.typography.labelLarge
	)
	}
	}
	)
	}
	@Preview(showBackground = true)
	@Composable
	fun GreetingPreview() {
	DefaultTheme {
	CalculatorApp()
	}
	}

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