BillTip

package com.example.billtip

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.material3.TextField
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.billtip.ui.theme.BillTipTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            Calculate()

        }
    }
}

//100 1% 1rs

@Composable
fun Calculate(){
    var totalBill by remember {
        mutableStateOf("0")
    }
    var tipPercentage by remember {
        mutableStateOf("0")
    }
    var ans by remember { mutableStateOf(0.0) }
    Column(
        modifier = Modifier
            .fillMaxSize()
            .padding(16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {
        TextField(value = totalBill, onValueChange = {totalBill = it}, label = { Text(text = "Enter Total Bill Amount")} )
        TextField(value = tipPercentage, onValueChange = {tipPercentage = it}, label = { Text(text = "Enter Tip Percentage")} )

        Button(onClick = { 
            var bill = totalBill.toDouble()
            var tip = tipPercentage.toDouble()
            ans = bill*(tip/100)
            
        }) {
            Text(text = "Calculate Tip Amount")
        }
        
        Text(text = "Tip Amount is ${ans}")
    }
}