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+// This is a potential solution for Assignment 1
 +
 +import java.util.Scanner;
 +
 +public class Assignment1 {
 +
 +    // Execution starts here
 +    
 +    public static void main(String[] args) {
 +
 +	// Represents if there are more customers in line or not
 +	
 +	boolean moreCustomers = true;
 +
 +	// The customer number.  Used for determining the customer
 +	// discount for every third customer.
 +	
 +	int customerNum = 0;
 +	
 +	Scanner sc = new Scanner(System.in);
 +
 +	// Loop while there are more customers
 +	
 +	while (moreCustomers) {
 +
 +	    // Set up local variables - used only in customer loop
 +	    // Put in here so they aren't kept from customer to customer -
 +	    // they will reset every time the loop ends
 +	    
 +	    int moreCustomersInput = 0; // Are there more customers?
 +	    int mainInput = 0; // Menu selection value
 +	    int numBooks = 0; // Number of books for customer
 +	    int numBookmarks = 0; // Number of bookmarks for customer
 +	    int numPaintings = 0; // Number of paintings for customer 
 +	    boolean notCheckedOut = true; // Whether or not customer is checked out
 +
 +	    // Check to see if another customer is in line.  If an invalid
 +	    // input is given, loop around until it is valid (1 or 2)
 +	    
 +	    moreCustomersInput = 0;
 +	    while (moreCustomersInput != 1 && moreCustomersInput != 2) {
 +		System.out.print("More customers in line? (1 = Yes, 2 = No) ");
 +		moreCustomersInput = sc.nextInt();
 +	    }
 +
 +	    // If no more customers, close the shop (exit program).
 +	    
 +	    if (moreCustomersInput == 2) {
 +		System.out.println("No more customers! Closing!");
 +		System.exit(0);
 +	    }
 +
 +	    // Increment the customer number, since we have a new one
 +	    
 +	    customerNum++;
 +
 +	    // Keep looping until the customer checks out.
 +
 +	    notCheckedOut = true;
 +	    
 +	    while (notCheckedOut) {
 +
 +		// Print main menu
 +		
 +		System.out.println("1 - Buy Books - $5.00 each");
 +		System.out.println("2 - Buy Bookmarks - $1.00 each, $5.00 for a six-pack");
 +		System.out.println("3 - Buy Paintings of Books - $100.00 each");
 +		System.out.println("4 - See current order");
 +		System.out.println("5 - Checkout");
 +		mainInput = 0;
 +
 +		// Get menu option.  Loop until valid input is given.
 +		
 +		while (mainInput < 1 || mainInput > 5) {
 +		    System.out.print("Please enter a valid option (1 through 5) > ");
 +		    mainInput = sc.nextInt();
 +		}
 +
 +		// Buy books (Option 1)
 +		
 +		if (mainInput == 1) {
 +		    System.out.println("Currently in cart: " + numBooks + " books.");
 +		    System.out.print("How many do you want to buy? > ");
 +
 +		    // Loop until a valid number of books given
 +		    
 +		    do {
 +			numBooks = sc.nextInt();
 +			if (numBooks < 0) {
 +			    System.out.println("Enter a valid number of books - 0 or more");
 +			}
 +		    } while (numBooks < 0);		    
 +		} else if (mainInput == 2) {
 +
 +		    // Buy bookmarks
 +		    
 +		    System.out.println("Currently in cart: " + numBookmarks + " bookmarks.");
 +		    System.out.print("How many do you want to buy? > ");
 +
 +		    // Loop until a valid number is given
 +		    
 +		    do {
 +			numBookmarks = sc.nextInt();
 +			if (numBookmarks < 0) {
 +			    System.out.println("Enter a valid number of bookmarks - 0 or more");
 +			}
 +		    } while (numBookmarks < 0);
 +		} else if (mainInput == 3) {
 +		    // Buy paintings
 +		    
 +		    System.out.println("Currently in cart: " + numPaintings + " paintings.");
 +		    System.out.print("How many do you want to buy? > ");
 +
 +		    // Loop until a valid number is given
 +		    
 +		    do {
 +			numPaintings = sc.nextInt();
 +			if (numPaintings < 0) {
 +			    System.out.println("Enter a valid number of paintings - 0 or more");
 +			}
 +		    } while (numPaintings < 0);
 +		} else if (mainInput == 4) {
 +		    // Display current contents of cart
 +		    System.out.println("Currently in cart: ");
 +		    System.out.println("Books: " + numBooks);
 +		    System.out.println("Bookmarks: " + numBookmarks);
 +		    System.out.println("Paintings of books: " + numPaintings);
 +		} else if (mainInput == 5) {
 +		    // Otherwise, check out.  This will end the main loop.
 +		    notCheckedOut = false;
 +		}
 +	    }
 +
 +	    // First ensure that they actually bought something.  If not,
 +	    // just move on to the next customer.
 +	    
 +	    if (numBooks == 0 && numBookmarks == 0 && numPaintings == 0) {
 +		System.out.println("Not buying anything? Have a nice day!");
 +	    } else {
 +		
 +		// Otherwise, prepare receipt.
 +		// Variables for receipt calculation
 +		
 +		double booksPrice = 0.0; // price of books
 +		double bookmarkPacksPrice = 0.0; // price of bookmark packs
 +		double singleBookmarksPrice = 0.0; // price of single bookmarks
 +		int numBookmarkPacks = 0; // number of bookmark packs
 +		int numSingleBookmarks = 0; // number of single bookmarks
 +		double paintingsPrice = 0.0; // price of paintings
 +		boolean thirdCustomer = false; // whether or not 3rd customer
 +		double subtotal = 0.0; // subtotal of receipt
 +		double total = 0.0; // total cost of order
 +		double amountSaved = 0.0;
 +		double tax = 0;
 +	    
 +		// Calculate bookmark packs and singles
 +		numBookmarkPacks = numBookmarks / 6;
 +		numSingleBookmarks = numBookmarks % 6;
 +	    
 +		// Print out receipt
 +		System.out.println("--------------------------------------");
 +
 +		// Check if customer is third customer; if so, give discount
 +		
 +		if (customerNum % 3 == 0) {
 +		    thirdCustomer = true;
 +		    System.out.println("You won a 10% discount!");
 +		} else {
 +		    System.out.println("You did not get a discount! Better luck next time!");
 +		}
 +
 +		// Calculate prices of individual items
 +		
 +		booksPrice = numBooks * 5.00;
 +		bookmarkPacksPrice = numBookmarkPacks * 5.00;
 +		singleBookmarksPrice = numSingleBookmarks * 1.00;
 +		paintingsPrice = numPaintings * 100.00;
 +		
 +		// Calculate subtotal (price of everything).
 +		// If they won the third-customer discount, also calculate
 +		// discount.
 +
 +		subtotal = booksPrice
 +		    + bookmarkPacksPrice
 +		    + singleBookmarksPrice
 +		    + paintingsPrice;
 +		if (thirdCustomer) {
 +		    amountSaved = subtotal * 0.1;
 +		    subtotal -= amountSaved;
 +		}
 +
 +		// Calculate tax on subtotal for total
 +		tax = subtotal * 0.07;
 +		total = subtotal + tax;
 +
 +		// Print out individual receipt elements.
 +		// For each, if number of items is 0, do not print out
 +		// that line.
 +		
 +		if (numBooks > 0) {
 +		    System.out.printf("%5d Book(s):                $%.2f\n", numBooks, booksPrice);
 +		}
 +		if (numBookmarkPacks > 0) {
 +		    System.out.printf("%5d Bookmark Pack(s):       $%.2f\n", numBookmarkPacks, bookmarkPacksPrice);
 +		}
 +		
 +		if (numSingleBookmarks > 0) {
 +		    System.out.printf("%5d Single Bookmark(s):     $%.2f\n", numSingleBookmarks, singleBookmarksPrice);
 +		}
 +		
 +		if (numPaintings > 0) {
 +		    System.out.printf("%5d Painting(s):            $%.2f\n", numPaintings, paintingsPrice);
 +		}
 +		if (thirdCustomer) {
 +		    System.out.printf("Discount! Saved:             -$%.2f\n", amountSaved);
 +		}
 +		System.out.printf("\nSubtotal:                     $%.2f\n", subtotal);
 +		System.out.printf("Tax:                          $%.2f\n", tax);
 +		System.out.printf("\nTotal:                        $%.2f\n", total);
 +		System.out.println();
 +		System.out.println("--------------------------------------");
 +
 +		// Get payment information.  Loop until valid (> cost)
 +		// value given.
 +		
 +		System.out.print("\nEnter amount paid (no dollar sign) > ");
 +		double paidCash = sc.nextDouble();
 +		while (paidCash < total) {
 +		    System.out.println("Not enough money, please re-enter.");
 +		    System.out.print("Enter amount paid (no dollar sign) > ");
 +		    paidCash = sc.nextDouble();
 +		}
 +
 +		// Calculate and give change.
 +		
 +		double change = paidCash - total;
 +		System.out.printf("\nYour change is: $%.2f\n", change);
 +	    
 +		System.out.println("Thanks for shopping!");
 +	    }
 +	}
 +    }
 +}