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Thread: Change Maker

  1. #1
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    Default Change Maker

    package change.maker;
    import java.util.Scanner;
    public class ChangeMaker 
    {
        public static void main(String[] args)
        {
            Scanner input = new Scanner(System.in);
            System.out.println("Please insert a set amount of money");
            double money;
            money = input.nextDouble();
            int dollars = 10, quarters = 10, dimes = 10, nickels = 10, pennies = 10;
            dollars = (int)(money%1);
            money = money - dollars;
            quarters = (int)(money%.25);
            money = money - quarters;
            dimes = (int)(money%.1);
            money = money - dimes;
            nickels = (int)(money%.25);
            money = money - nickels;
            pennies = (int)(money%.01);
            System.out.println(dollars + " dollars " + quarters + " quarters " + dimes + " dimes " + nickels + " nickels " + pennies + " pennies.");
        }
    }


    What is wrong with this?


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Change Maker

    You tell us. What does this code do?

    What happened when you stepped through it with a debugger, or at least added some print statements, to figure out when the program's execution differs from what you expected?

    It looks like you wrote the whole thing before really testing it, which is definitely not the way to go. Start over, and test one tiny piece at a time. Can you write a program that outputs the correct amount of dollars, ignoring any change? If you can't get that working, then use a debugger or print statements to figure out what you're doing wrong. When you do get that working, then move on to including quarters, ignoring the rest of the change. Repeat that process until you're done.

    If you get stuck, post that tiny program (also known as an MCVE), and tell us exactly what it's doing wrong, and we'll go from there.
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  3. #3
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    Default Re: Change Maker

    package changemaker;
    import java.util.Scanner;
     
    public class ChangeMaker 
    {
        public static void main(String[] args) 
        {
            Scanner scanner = new Scanner(System.in);
            int amount, originalAmount, quarters, dimes, nickels, pennies;
     
            System.out.println("Enter the amount of change");
            amount = scanner.nextInt();
            originalAmount = amount;
            amount = amount.replace('X','');
     
            quarters = amount / 25;
            amount = amount % 25;
            dimes = amount / 10;
            amount = amount %10;
            nickels = amount / 5;
            amount = amount %5;
            pennies = amount;
     
            System.out.println(originalAmount + " cents in coins can be given as:\n" + quarters + " quarters\n" + dimes + " dimes\n" + nickels + " nickels\n" + pennies + " pennies");
        }
     
    }

    I think i figured it out. Thanks!

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