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Thread: Two-dimensional boolean array?

  1. #1
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    Default Two-dimensional boolean array?

    Hi,
    I'a beginner in Java language. I saw the following exercise from the following web:
    http://introcs.cs.princeton.edu/14array/
    I tryied to solve it, but can't get it. Please help .

    Write a code fragment that prints the contents of a two-dimensional boolean array, using * to represent true and a space to represent false. Include row and column numbers.

    below is my effort....
    public void 2Ddisplay() {
        	for (int x = 0; x < 2Darray[0].length; x++) {
        	for (int y = 0; y < 2Darray.length; y++) {
        	if (pixels[x][y] == true) {
        	System.out.println("*");
        	} else {
        	System.out.println(" ");
        	}
     
     
        	}
        	}
        }
    boolean 2Darray[][];
    int w,h;
    Thank you
    Last edited by tcmei; May 17th, 2011 at 07:02 PM.


  2. #2
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    Default Re: Two-dimensional boolean array?

    The instructions say to use * to represent true and space for false. Therefore you need a 2D char array not a boolean array.

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    Default Re: Two-dimensional boolean array?

    There's only a 2 possible values, therefore a 2d boolean array will work perfectly fine (not to mention that the problem specifically says to represent the contents of a 2d boolean array as such ).

    You say you can't get it, what did you mean by that statement? Are your outputs wrong? Or are you getting an exception/compile error? If so, please post the message.

    One thing I can see right away is that you're printing out each element on it's own line. You might want to consider using System.out.print to print out a row, then use an empty System.out.println to advance to the next row.

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