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Thread: Program does not work

  1. #1
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    Default Program does not work

    Hi, newbie to the forum
    I am a beginner in java eclipse and having a problem with the program i had to write. The program ask the user to enter 9 digit then it is to produce the 9 numbers plus the 10th number. That does not happen. Any help would be appreciated thanks.

    John
    P/S please let me know if i posted correctly.


    [highlight = java]


    import java.util.Scanner;
    public class Exercise3_9 {

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



    while (true) {
    //Prompt the user to enter first 9 ISBN digits
    System.out.print("Enter the first 9 digits of the ISBN: ");
    int d1 = input.nextInt();
    int d2 = input.nextInt();
    int d3 = input.nextInt();
    int d4 = input.nextInt();
    int d5 = input.nextInt();
    int d6 = input.nextInt();
    int d7 = input.nextInt();
    int d8 = input.nextInt();
    int d9 = input.nextInt();

    // Calculate
    int d10 = ((d1 * 1) + (d2 * 2) + (d3 * 3) + (d4 * 4) + (d5 * 5) + (d6
    * 6) + (d7 * 7) + (d8 * 8) + (d9 * 9))% 11;

    if (d10 ==10)
    System.out.println("The ISBN-10 number is " + "x");
    else
    System.out.println("The ISBN-10 number is " + "");
    System.out.println();
    }
    }
    }

    [/highlight]


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Program does not work

    What happens instead? What did you find out when you stepped through this with a debugger, or at least added some print statements, to figure out when the program's execution differs from your expectation?
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  3. #3
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    Default Re: Program does not work

    Quote Originally Posted by KevinWorkman View Post
    What happens instead? What did you find out when you stepped through this with a debugger, or at least added some print statements, to figure out when the program's execution differs from your expectation?

    Kevin,
    This is what i get.

    Enter the first 9 digits of the ISBN: 013601267

    What needs to happen is this:
    Enter the first nine digits of an ISBN as integer: 013601267
    The ISBN-10 number is 0136012671

    John

  4. #4
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    Default Re: Program does not work

    Put a print statement after the first "input.nextInt();" and tell us when it gets executed. I suspect the nextInt() method doesn't trigger until an "end-case" for the input is reached. By that, I mean: how does the Scanner know your first integer is supposed to be "0" instead of "013601267"? If it is taking "013601267" as your first int (which I suspect it is), your program will hang on the second nextInt(), since it is waiting another int to be inputted.
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  5. #5
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    Default Re: Program does not work

    I am sorry but i am really new at this programming stuff, so i don't quite understand the print statement.

  6. #6
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    Default Re: Program does not work

    KW's point is that you have 9 calls to input.nextInt(), and the first call is taking the entire user input of "013601267", and is waiting for the user to input a second digit, because that's how the nextInt() method works. Try giving the input statements one character (or digit) at a time separated by white space, as in: 0<space>1<space>3<space>6, etc. . .

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