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Thread: Magic square class (modular math problem)

  1. #1
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    Default Magic square class (modular math problem)

    Hi, I'm new to Java. I am trying to write a program that will print magic squares of odd order.

    Here is the code:

    class MagicSquare
    {
         public static void main (String args[])
         {
              if(args.length > 1)
              {
                   System.out.println("Too many arguments entered");
              }
              else
              {
                   int sqrOrd = Integer.parseInt(args[0]);
                   int magSqr[][] = new int [sqrOrd][sqrOrd];
                   if (sqrOrd % 2 == 0)
                   {
                        System.out.println("Square order is even");
                   }
                   else
                   {
                        int rowNum;
                        int colNum;
     
                        for (rowNum = 0; rowNum < sqrOrd; rowNum++)
                        {
                             for (colNum = 0; colNum < sqrOrd; colNum++)
                             {
                                  magSqr[rowNum][colNum] = -1;
                                  //System.out.print(magSqr[rowNum][colNum]);
                             }
                             System.out.println();
                        }
     
                        int maxNum = sqrOrd * sqrOrd;
                        rowNum = 0;
                        colNum = sqrOrd / 2 + 1;
                        magSqr[rowNum][colNum] = 1;
     
                        for (int curNum = 1; curNum <= maxNum; curNum++)
                        {
                             if (magSqr[(rowNum - 1 + sqrOrd) % sqrOrd][(colNum + 1) % sqrOrd] == -1)
                             {
                                  rowNum = (rowNum - 1 + sqrOrd) % sqrOrd;
                                  colNum = (colNum - 1 + sqrOrd) % sqrOrd;
                             }
                             else
                             {
                                  rowNum = (rowNum + 1) % sqrOrd;
                             }
                             magSqr[rowNum][colNum] = curNum;
                        }
                        for (rowNum = 0; rowNum < sqrOrd; rowNum++)
                        {
                             for (colNum = 0; colNum < sqrOrd; colNum++)
                             {
                                  System.out.print(magSqr[rowNum][colNum] + "  ");
                             }
                             System.out.println();
                        }
                   }
              }
         }       
    }

    My main problem is that, while the code compiles without any errors or warnings, the program does not print a magic square; it print an array where only some of the elements are replaced by the numbers 1 through n^2.

    I think I am having some problem with the math controlling the if statements. Any help would be appreciated.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Magic square class (modular math problem)

    See Magic squares help - Java Forums

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