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Thread: Formatting 2d Array Output

  1. #1
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    Default Formatting 2d Array Output

    I was wondering if there is a way to format the output of an array so that each indexed item has a discriptor and formatted in a certian way?

    Example:

    I have an array with 2 rows and 2 columns filled with numbers = double[][] numberArray = new double[2][2];

    sample data
    [0][0] = 1
    [0][1] = 1
    [1][0] = 2
    [1][1] = 2

    When I run my for loops my output statement is:

    for (int i=0; i<ROWS; i++)
    {
    for (int j=0; j<COLUMNS; j++)
    {
    System.out.print(" " + numberArray[i][j]);
    }

    This will output something like this:
    1.0 1.0
    2.0 2.0

    I would like to format the output to look like this:

    Day 1 Earnings $ 1.00
    Day 2 Earnings $ 2.00

    If I try the System.out.printf(.......); I can only put one discriptor and one format for both columns. I would like to format each column seperately from each other.

    Could you please point me in the right direction?

    Thanks,

    DS


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Formatting 2d Array Output

    Please post the code you are having problems with. The printf() method should be able to print multiple values on multiple lines.

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    Default Re: Formatting 2d Array Output

    The code that I need help with is:

    for (int i=0; i<ROWS; i++)
    {
    for (int j=0; j<COLUMNS; j++)
    {
    System.out.print(" " + numberArray[i][j]);
    }

    The problem is when I use the printf to format I don't know how to insert a discriptor in front of each column and format the numbers that are stored in the array.

    Here is an example:

    System.out.printf("Day %5.0f", numberArray[i][j]);

    it will output this:

    Day 1 Day 2

    I would like to make a format statement that would allow me to format for the [0][0] and then another format for [0][1] and all the way down the array.

    Thanks,

    DS

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Formatting 2d Array Output

    Something like this?
    System.out.printf("Day %5.0f <Descriptor here> %5.0f\n", numberArray[i][j], numberArray[i][j+1]);

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    Default Re: Formatting 2d Array Output

    Thank you so much.

    I put in what you had up top and it would print the first line perfectly but it threw an error:
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
    at arraywork.ArrayWork.main(ArrayWork.java:36)
    Java Result: 1

    I added a -1 behind the COLUMNS and now it works perfectly.
    Thank you

  6. #6
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    Default Re: Formatting 2d Array Output

    My code was not intended to be usable as posted. It was just an idea of how to do it.

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