Commenting the code

TipTime/app/src/main/java/com/example/tiptime/MainActivity.kt

@@ -7,6 +7,7 @@ import java.text.NumberFormat
 
 class MainActivity : AppCompatActivity() {
 
+    //setting binding (the latest way of accessing views and items from resources)
     private lateinit var binding: ActivityMainBinding
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -17,21 +18,21 @@ class MainActivity : AppCompatActivity() {
 
         binding.calculateButton.setOnClickListener { calculateTip() }
     }
-
+    //function that calculates the tip amount
     private fun calculateTip() {
         val stringInTextField = binding.costOfService.text.toString()
         val cost = stringInTextField.toDoubleOrNull()
         if (cost == null) {
             binding.tipResult.text = ""
             return
         }
-
+    //when keyword is used here to set the value of the tip percent as per the user rates through UI
         val tipPercentage = when (binding.tipOptions.checkedRadioButtonId) {
             R.id.option_twenty_percent -> 0.20
             R.id.option_eighteen_percent -> 0.18
             else -> 0.15
         }
-
+    //final calculation of tip (along with rounding it off)
         var tip = tipPercentage * cost
         if (binding.roundUpSwitch.isChecked) {
             tip = kotlin.math.ceil(tip)
@@ -40,4 +41,4 @@ class MainActivity : AppCompatActivity() {
         val formattedTip = NumberFormat.getCurrencyInstance().format(tip)
         binding.tipResult.text = getString(R.string.tip_amount, formattedTip)
     }
-}
+}