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Thread: change finder

  1. #1
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    Default change finder

    hey guys below is my code for a change finder the code takes in a sales total and the amount payed and gives a change value and the amount of coins without using nickles. i cant seem to figure out however why the code is one cent short on
    Given $36.0 for a purchase of $32.27 we need
    3 dollars 2 quarters 2 dimes 2 cents

    it should be 3 cents not 2 it is right on my other tests however.
    here is my code

    import java.util.Scanner;
    public class Change {
    public static void main(String [] args) {
    double purchase;
    double pay;
    double change;
    int balance;
    int dollars;
    int quarters;
    int dimes;
    int cents;
     
    Scanner in = new Scanner(System.in);
    System.out.print("purchase");
    purchase = in.nextDouble();
    System.out.println("payment");
    pay = in.nextDouble();
     
    change = pay - purchase;
    balance = (int)(change * 100);
    System.out.println(balance);      
    dollars = balance / 100;
    balance = (balance - (100 * dollars));
    quarters = balance / 25;
    balance = (balance - (25 * quarters));
    dimes = balance / 10;
    balance = (balance - (10 * dimes));
    cents = balance / 1;
    balance = balance - (1 * cents);
     
     
     
    System.out.println("Given $" + pay + " for a purchase of $" + purchase + " we need");
    System.out.println(dollars + " dollars " + quarters + " quarters " + dimes + " dimes " + cents + " cents");
     
    }
    }

    any help is appreciated i am stuck as to how to fix it. thanks i look forward to any suggestions.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: change finder

    The code is not properly formatted making it hard to read and understand. All statements should not start in the first column. Nested statements should be indented 3-4 spaces.

    Print out the value of change to see what the problem is. There is a problem working with doubles with integer like values. There is a web page somewhere that explains the rounding/precision problems with using doubles for currency computations.
    I got this from google:
    http://docs.oracle.com/cd/E19957-01/..._goldberg.html
    If you don't understand my answer, don't ignore it, ask a question.

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