Lab #1 (Exercise 2-3)

Modify the Invoice application

Due Date: Tuesday of Week 1
10 points

Before you start, check which team you belong to.

If you downloaded the file, open the file named InvoiceApp.java that's in your computer or USB drive. Save the program as ModifiedInvoiceApp.java. Change the class name to ModifiedInvoiceApp. If you don't have the file, copy and paste the code below:

import java.util.Scanner;

public class InvoiceApp
{
    public static void main(String[] args)
    {
        // welcome the user to the program
        System.out.println("Welcome to the Invoice Total Calculator");
        System.out.println();  // print a blank line

		// create a Scanner object named sc
		Scanner sc = new Scanner(System.in);

        // perform invoice calculations until choice isn't equal to "y" or "Y"
        String choice = "y";
        while (choice.equalsIgnoreCase("y"))
        {
		    // get the invoice subtotal from the user
            System.out.print("Enter subtotal:   ");
        	double subtotal = sc.nextDouble();

        	// calculate the discount amount and total
        	double discountPercent= 0.0;
        	if (subtotal >= 200)
        		discountPercent = .2;
        	else if (subtotal >= 100)
        		discountPercent = .1;
        	else
        		discountPercent = 0.0;
        	double discountAmount = subtotal * discountPercent;
        	double total = subtotal - discountAmount;

            // display the discount amount and total
        	String message = "Discount percent: " + discountPercent + "\n"
        	               + "Discount amount:  " + discountAmount + "\n"
                           + "Invoice total:    " + total + "\n";
        	System.out.println(message);

        	// see if the user wants to continue
        	System.out.print("Continue? (y/n): ");
        	choice = sc.next();
        	System.out.println();
		}
    }
}

Modify the code so the applications ends only when the user enters "n" or "N". As it is now, the application ends when the user enters anything other than "y" or "Y". To do this, you need to use a not operator (!) with equalsIgnoreCase method. Compile this class and test this change by entering 0 at the Continue? prompt.
Modify the code so that it provides a discount of 25 percent when the subtotal is greater than or equal to $500. Then test this change.
Modify the code so that it displays the number of invoices, the average invoice amount, and the average discount amount when the user ends the program. Then, test this change.

Include in your program the following comments:

Name of program
Team's name with all the names of the members (e.g. Team A: John Doe, Jane Smith, etc.)
Current Date
Computer system and compiler you are using
Brief description of the program

Compile and run the Java program.

Take a screen capture by hitting simultaneously the keys Alt and Print Screen (Prt Sc) of the output results (console) and paste it in MS Paint. Save it as a gif file.

When you are ready, upload the java program and the gif file by clicking the link below:

Upload Lab

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