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Thread: Addition Table.

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    Default Addition Table.

    Thanks kevin for help on the last post, it really helped a lot, but I am now trying to make an addition table with a logarithm at the top, which works. The addition table is actually a multiplication table but I need to convert it to an addition table, i've tried tinkering with some variables but I cannot seem to do it, thanks!
    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package mathtables;
     
    /**
     *
     * @author student
     */
    public class MathTables {
     
     
        public static void main(String[] args) {
     
     
            printCommonLogTable();
            printAdditionTable ();
     
        }
     
        public static void printCommonLogTable () {
            double x = .5;
            while (x < 10.0) {
                System.out.println(x + "  " + Math.log(x));
                x = x + .5;
            }
     
     
        }
        public static void printAdditionTable () {
            {
             int i = 1;
             while (i <= 12) {
                 printMultiples (i);
                 i = i + 1;
             }
     
            }
            System.out.println("");
     
     
        }
        public static void printMultiples (int n) {
            int i = 1;
            while (i <= 12) {
                System.out.print(n*i + "   ");
                i = i + 1;
            }
            System.out.println("");
        }
     
    }


  2. #2
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    Default Re: Addition Table.

    What exactly do you mean when you say you cannot seem to do it? What does it do instead? Have you tried stepping through this with a debugger, or at least a piece of paper and a pencil?
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    Default Re: Addition Table.

    It runs fine, but I am trying to get it to print a addition table not a multiplication table.
    run:
    0.5  -0.6931471805599453
    1.0  0.0
    1.5  0.4054651081081644
    2.0  0.6931471805599453
    2.5  0.9162907318741551
    3.0  1.0986122886681098
    3.5  1.252762968495368
    4.0  1.3862943611198906
    4.5  1.5040773967762742
    5.0  1.6094379124341003
    5.5  1.7047480922384253
    6.0  1.791759469228055
    6.5  1.8718021769015913
    7.0  1.9459101490553132
    7.5  2.0149030205422647
    8.0  2.0794415416798357
    8.5  2.1400661634962708
    9.0  2.1972245773362196
    9.5  2.2512917986064953
    1   2   3   4   5   6   7   8   9   10   11   12   
    2   4   6   8   10   12   14   16   18   20   22   24   
    3   6   9   12   15   18   21   24   27   30   33   36   
    4   8   12   16   20   24   28   32   36   40   44   48   
    5   10   15   20   25   30   35   40   45   50   55   60   
    6   12   18   24   30   36   42   48   54   60   66   72   
    7   14   21   28   35   42   49   56   63   70   77   84   
    8   16   24   32   40   48   56   64   72   80   88   96   
    9   18   27   36   45   54   63   72   81   90   99   108   
    10   20   30   40   50   60   70   80   90   100   110   120   
    11   22   33   44   55   66   77   88   99   110   121   132   
    12   24   36   48   60   72   84   96   108   120   132   144

  4. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Addition Table.

    Well, you call a function that prints out the multiples, and it does exactly that. What did you expect to happen? Where is the code that's supposed to print out the addition table?
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    Default Re: Addition Table.

    Our teacher gave us the printMultiples example in the book, and told us to copy it and transform it into an addition table. I do not know how to do this and I am looking for some help.

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    Default Re: Addition Table.

    Any help would be great.

  7. #7
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    Default Re: Addition Table.

    Think about how you figure out a multiplication table, just with a piece of paper and a pencil. Then look at how the code does the same thing. Now think about how you would figure out an addition table, just with a piece of paper and a pencil. Maybe draw a few until you see a pattern. Then look at the existing code and think about how you would change it to do what you do in your head.
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    Default Re: Addition Table.

    Thanks Kevin!

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