This assignment should use JOptionPane to do input and output . Write a program

Question

This assignment should use JOptionPane to do input and output. Write a program that reads the subtotal and the gratuity rate, and computes the gratuity and total. For example, if the user enters 10 for subtotal and 15% for gratuity rate, the program displays $1.5 as gratuity and $11.5 as total. Please make sure to implement correct rounding of the subtotal and tip amounts to avoid fractional cents. For testing purpose consider subtotal of $23.77 and a gratuity rate of 19%. Correct result would be tip amount of $4.52 (or $4.51 depending on rounding policy) but not $4.5163 and the total would be $28.29 (or $28.28 depending on rounding policy) but not $28.2863

Explanation / Answer

package com.chegg.gratuity;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class GratuityTest {
static String tip;
static String subtotal;
static double total;
   public static void main(String[] args) {
       JFrame parent = new JFrame();
       subtotal = JOptionPane.showInputDialog("Enter Amount :");
       double amount = Double.parseDouble(subtotal);
       tip = JOptionPane.showInputDialog("Enter tip persentage :");
       double tipAmount = Double.parseDouble(tip);
       double gratuity = (amount*tipAmount)/100;
       double roundGratuity = Math.round(gratuity*100.0)/100.0;
       JOptionPane.showMessageDialog(parent, "Graduity is ");
       JOptionPane.showMessageDialog(null, roundGratuity);
       total = amount + gratuity;
       double roundTotal =Math.round(total*100.0)/100.0;
       JOptionPane.showMessageDialog(parent, "Total is ");
       JOptionPane.showMessageDialog(null, roundTotal);
      
   }

}

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