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Thread: rows and columns in the form of...

  1. #1
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    Default rows and columns in the form of...

    Hello, I am making rows and columns in the form of a multiplication table, listed below is my code:

    package assignments;
     
    public class MultTable 
    {
        public static void main (String [] args)
        {
     
            int row, column, x, y;
     
            for(row = 0; row < 8; row++)
            {
                System.out.println();
                for(column = 0; column < 15; column++)
                {
                    System.out.printf ("%3d", column*row);
     
                }//tier 2 for loop: columns
            }//tier 1 for loop: rows
     
            System.out.println ();
        }
    }

    If you see my sample run you can see that I have the multiplication table down but, I haven't completed it.

    I have to make the bottom left half of the whole table blank somehow

    for example, I have to make it halfway through the middle of the table the bottom left half full of white space...

    5 6 7 8 9
    12 14 16 18
    21 24 27
    32 36
    90

    hm, it's supposed to be the other way around horizontally.
    Last edited by ggx7; March 12th, 2014 at 10:35 AM. Reason: its actually supposed to be diagonally altered from top left to bottom right.


  2. #2
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    Default Re: rows and columns in the form of...

    And what have you tried? I assume you're trying to add spaces to format those numbers correctly (the forum eliminates extra white space). Have you tried doing something similar in your code?
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    Default Re: rows and columns in the form of...

    Quote Originally Posted by KevinWorkman View Post
    And what have you tried? I assume you're trying to add spaces to format those numbers correctly (the forum eliminates extra white space). Have you tried doing something similar in your code?
    Hm.. I feel like I'm close but not quite there, I took a look at my notes and because I've written them poorly, they look like this

    for(column=n-row; column++), I think I'm getting closer to the idea.

    Need to write my notes better next time, here's my code listed below:
    package assignments;
     
    public class MultTable 
    {
        public static void main (String [] args)
        {
     
            int row, column, space, x, y;
            System.out.println ("         0   1   2   3   4   5   6   7   8   9"
                    + "   10   11   12   13   14   15");
            System.out.println ("________________________________________"
                    + "_______________________________________");
     
            for(row = 0; row <= 15; row++)
            {
     
                System.out.println();
     
                for(column = 0; column <= 15; column++)
                {
                    System.out.printf ("%5d", column*row);
     
                }//tier 2 for loop: columns
            }//tier 1 for loop: rows
     
            System.out.println ();
        }//end main
    }//end class

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    Default Re: rows and columns in the form of...

    Put away your notes and play with the code you've posted. You can't possibly write notes on everything that you'll need to finish every project. Sometimes you have to examine the problem, think of possible solutions, and connect things you've learned in different ways to discover the right solution.

    Decide what needs to be fixed, consider the possible options to make the fix, and try them out. As you go through this phase of fix (maybe), test, fix, be sure to have code that you can always fall back on that's not too far off. Save the original version in a separate editor, make small changes one at a time, and save each version that gets closer to the desired result as you go. If you get completely lost and have scrambled code that doesn't compile or work at all, fallback to the last saved version.

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    Default Re: rows and columns in the form of...

    Can anyone help me out? I've tried every possibly thing that I know of, I think I should at least have 3 for loops, played around with it, but still getting nowhere.

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    Default Re: rows and columns in the form of...

    We're always interested in seeing "every possible thing you know of."

    First describe what you're trying to do - what's wrong with the output of the code you've posted. Then describe what you thought of to fix it and post the code you tried to implement what you thought of. What was wrong with those attempts? If you got errors from those attempts, post those. Start with the thought and code that got you closest to fixing the code.

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