Chapter 2 Question 2.5, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Financial application: calculate tips) Write a program that reads the subtotal and the gratuity rate, then 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.

Solution

import java.util.Scanner;

public class HelloWorld

{

    public static void main(String[] args)

    {

        Scanner input = new Scanner(System.in); // Create new Scanner object.

        // Prompt the user to enter the subtotal and the gratuity rate

        System.out.print("Enter the subtotal and a gratuity rate: ");

        double subtotal = input.nextDouble();

        double gratuityRate = input.nextDouble();

        // Calculate gratuity and total

        double gratuity = subtotal * (gratuityRate / 100);

        double total = subtotal + gratuity;

        // Display results

        System.out.println("The gratuity is $" + gratuity +

            " and total is $" + total);

    }

}

OUTPUT

Enter the subtotal and a gratuity rate: 12 34

       

The gratuity is $4.08 and total is $16.08