Assignment # 103 and Keychains ULtimate Power

Code

    /// Name: Tommy Oyuntseren
    /// Period: 7
    /// Program Name: KeychainsUltimatePower
    /// File Name: KeychainsUltimatePower.java
    /// Date: 4/12/2016


     import java.util.Scanner;
    
    public class KeychainsUltimatePower
    {
        public static void main ( String[] args )
        {
            Scanner keyboard = new Scanner(System.in);
            
            int choice, numKeychains = 0, pricePerKeychain = 10, baseShipping = 5, perKeychainShipping = 1;
            double tax = .0825;
            
            System.out.println("Unique Keychain Shop");
            
            do
            {
            System.out.println("\n1. Add Keychains to Order");
            System.out.println("2. Remove Keychains from Order");
            System.out.println("3. View Current Order");
            System.out.println("4. Checkout");
            System.out.print("\nPlease enter your choice: ");
            choice = keyboard.nextInt();
            
            while (choice> 4 || choice< 1)
            {
                System.out.print("Error. Please choose a number between one and four. Try again: ");
                choice = keyboard.nextInt();
            }
                
            if (choice== 1)
            {
                numKeychains= addKeychains(numKeychains);
            }
            else if (choice== 2)
            {
                numKeychains= removeKeychains(numKeychains);
            }
            else if (choice== 3)
            {
                viewOrder(numKeychains, pricePerKeychain, tax, baseShipping, perKeychainShipping);
            }
            else if (choice== 4)
            {
                checkout(numKeychains, pricePerKeychain, tax, baseShipping, perKeychainShipping );
            }
            }while (choice!= 4);
        }
        
        public static int addKeychains(int numKeychains)
        {
            Scanner keyboard= new Scanner(System.in);
            
            System.out.print("\nYou have " + numKeychains + " keychains. How many to add? ");
            int add= keyboard.nextInt();
            
            while (add< 0)
            {
                System.out.print( "You must add a positive number of keychains. Try again: how many would you like to add? ");
                add = keyboard.nextInt();
            }
            
            numKeychains= numKeychains + add;
            
            System.out.print("You now have " + numKeychains + " keychains.\n");
            return numKeychains;
        }
        
        public static int removeKeychains(int numKeychains)
        {
            Scanner keyboard= new Scanner(System.in);
            
            System.out.print("\nYou have " + numKeychains + " keychains. How many would you like to remove? ");
            int remove = keyboard.nextInt();
            
            while (remove> numKeychains)
            {
                System.out.println( "Error. The number of keychains to remove exceeds number of keychains in cart.");
                System.out.print( "How many would you like to remove? " );
                remove= keyboard.nextInt();
            }
            
            numKeychains= numKeychains - remove;
            
            
            System.out.print("You now have " + numKeychains + " keychains.\n");
            return numKeychains;
        }
        
        public static void viewOrder( int numKeychains, int pricePerKeychain, double tax, int baseShipping, int perKeychainShipping )
        {
            System.out.println("\nYou have " + numKeychains + " keychains. " );
            System.out.println( "Keychains cost $10 each.  The cost of " + numKeychains + " keychains is $" + ( numKeychains * pricePerKeychain ) + "." );
            System.out.println( "The shipping charges are $" + ( baseShipping + (numKeychains * perKeychainShipping) ) + "." );
            int subtotal = (numKeychains * pricePerKeychain) + baseShipping + (numKeychains * perKeychainShipping);
            System.out.println( "The subtotal is $" + subtotal + "." );
            System.out.println("The tax is $" + ( tax * subtotal ) + "." );
            System.out.println( "The final cost is $" + ((tax * subtotal) + subtotal) + ".");
        }
        
        public static void checkout(int numKeychains, int pricePerKeychain, double tax, int baseShipping, int perKeychainShipping)
        {
            Scanner keyboard= new Scanner(System.in);
            
            System.out.println("\nCHECKOUT\n");
            
            System.out.print("What is your name? " );
            String name = keyboard.next();
            viewOrder(numKeychains, pricePerKeychain, tax, baseShipping, perKeychainShipping);
            System.out.println("Thanks for your order, " + name + "!");
        }
    }
         
   

  

Picture of the output