class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            Greeting("Android")
        }
    }
}

@Composable
fun Greeting(name: String) {

    Text(text = "Hello $name!")
    
}

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {

    Greeting("Android")

}