Question

Language = Java

Create a program to receive book prices until a sentinel value is entered. (Be sure to tell your user what the sentinel value is so they can type it to indicate they are finished with entering input.) After the sentinel value is entered, compute the total book order total and return the following to the user.

As book prices are entered, you'll need to have some way to capture the number of books they ordered and the running subtotal for use in the total book order price.

Compute the tax and shipping as usual (tax is 5.5 percent of the total book price & shipping charge is $1.50 per book). The price of the order is still the sum of the total book price, the tax, and the shipping charge. Output a receipt formatted as the following:

Enter the book price and press enter or type 999 when you are finished added books: 12.22 Enter another book price and press enter or type 999 when you are finished added books: 12.00 Enter another book price and press enter or type 999 when you are finished added books: 13.33 Enter another book price and press enter or type 999 when you are finished added books: 999 Number of books purchased: 3 Book Subtotal: $37.55 Tax: $2.07 Shipping: $4.50 ------------------------ Order Total: $44.12

IMPORTANT TESTING NOTE: Double check your math to make sure your sentinel value isn't being added into the book total and that you don't end up with an extra book in the number of books purchased. You can prevent that by setting up your loop correctly. If you are subtracting 1 from the book count or subtracting the sentinel value, you do not have your loop set up correctly.

Answer 1

Program Screen Shot:

Sample Output:

Program Code to Copy:

import java.util.Scanner;
public class BooksOrder {

   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       double price;
       // initialize to zero for cumulative sum operations
       int numberOfBooks = 0;
       double subTotal = 0;
      
       do {
           System.out.print("Enter the book price and press enter" +
       "or type 999 when you are finished added books:");
           price = input.nextDouble();
           if(price!=999) { // check exit status first before computing anything
               numberOfBooks += 1;
               subTotal += price;
           }
       }while(price!=999); // exit loop
      
       // compute final results
       double tax = subTotal*5.5/100;
       double shippingCharge = numberOfBooks*1.5;
       double orderTotal = subTotal + tax + shippingCharge;
       // show receipt
       System.out.println("Number of books purchased: "+ numberOfBooks);
       System.out.println("Book Subtotal: $"+String.format("%.2f",subTotal));
       System.out.println("Tax: $" + String.format("%.2f",tax));
       System.out.println("Shipping: $" + String.format("%.2f",shippingCharge));
       System.out.println("-------------------------------");
       System.out.println("\nOrder Total: $" + String.format("%.2f",orderTotal));
   }
}

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