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Thread: Need help with this program

  1. #1
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    Default Need help with this program

    import java.util.Scanner;
    public class PP_2_11a
    {
    //---------------------------------------------------------------------
    // Reads amount of money and determines what bills and coins are needed
    //---------------------------------------------------------------------

    public static void main (String[]args)
    {
    double total_amount;
    Scanner scan = new Scanner (System.in);



    boolean more = true;

    while (more)
    {
    System.out.println ("Enter amount of money.");
    total_amount = scan.nextDouble();


    int tens = (int)total_amount/10;
    total_amount = total_amount%10;
    int fives = (int)total_amount/5;
    total_amount = total_amount%5;
    int ones = (int)total_amount/1;
    total_amount = total_amount%1;
    int quarters = (int)(total_amount/.25);
    total_amount = (total_amount%.25);
    int dimes = (int)(total_amount/.10);
    total_amount = (total_amount%.10);
    int nickels = (int)(total_amount/.05);
    total_amount = (total_amount%.05);
    int pennies = (int)(total_amount%.01);



    System.out.println (tens + " ten dollar bills");
    System.out.println (fives + " five dollar bills");
    System.out.println (ones + " one dollar bills");
    System.out.println (quarters + " quarters");
    System.out.println (dimes + " dimes");
    System.out.println (nickels + " nickels");
    System.out.println (pennies + " pennies");

    System.out.print ("Enter 1 to continue, 0 to quit > ");
    more = (1 == scan.nextInt());
    }


    }
    }


    it does not calculate properly when I input the amount 68.97
    please help
    thank you!


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Need help with this program

    it does not calculate properly when I input the amount 68.97
    Please explain what the code should do.
    Copy and paste here the contents of the console screen from when you run the program
    Add some comment to the output saying what the output should be.
    To copy the contents of the command prompt window:
    Click on Icon in upper left corner
    Select Edit
    Select 'Select All' - The selection will show
    Click in upper left again
    Select Edit and click 'Copy'

    Paste here.

    There are some problems working with floating point numbers.
    Read this:http://download.oracle.com/docs/cd/E..._goldberg.html

    One trick is to convert the amount to cents and scale your divisors accordingly.
    Last edited by Norm; September 18th, 2011 at 04:48 PM.

  3. #3
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    Default Re: Need help with this program

    my program needs to be able to read the amount of money and then output how many tens, fives, ones, quarters, dimes and so on that are needed to make the amount.
    When I run the program it does everything right except it does not calculate the amount of pennies right:
    ----jGRASP exec: java PP_2_11a

    Enter amount of money.
    68.97
    6 ten dollar bills
    1 five dollar bills
    3 one dollar bills
    3 quarters
    2 dimes
    0 nickels
    1 pennies
    Enter 1 to continue, 0 to quit >

    there should be 2 pennies but I do not understand why it is not calculating it right.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Need help with this program

    Add some printlns in your code to print out the intermediate values so you can see what is happening.

  5. The Following User Says Thank You to Norm For This Useful Post:

    javalava11 (September 18th, 2011)

  6. #5
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    Default Re: Need help with this program

    I was able to find out where it went wrong when I put in the printlns-thank you!

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