odd ordered magic matrix.c

// C program to generate odd sized magic squares
#include<stdio.h>
#include<string.h>
// A function to generate odd sized magic squares
void
generateSquare (int n)
{
  int magicSquare[n][n];
// set all slots as 0
  memset (magicSquare, 0, sizeof (magicSquare));
// Initialize position for 1
  int i = n / 2;
  int j = n - 1;
// One by one put all values in magic square
  for (int num = 1; num <= n * n;)
    {
      if (i == -1 && j == n)	//3rd condition
	{
	  j = n - 2;
	  i = 0;
	}
      else
	{
// 1st condition helper if next number
// goes to out of square's right side
	  if (j == n)
	    j = 0;
// 1st condition helper if next number
// is goes to out of square's upper side
	  if (i < 0)
	    i = n - 1;
	}
      if (magicSquare[i][j])	//2nd condition
	{
	  j -= 2;
	  i++;
	  continue;
	}
      else
	magicSquare[i][j] = num++;	//set number
      j++;
      i--;			//1st condition
    }
// Print magic square
  printf ("The Magic Square for n=%d:\nSum of "
	  "each row or column %d:\n\n", n, n * (n * n + 1) / 2);
  for (i = 0; i < n; i++)
    {
      for (j = 0; j < n; j++)
	printf ("%3d ", magicSquare[i][j]);
      printf ("\n");
    }
}

// Driver program to test above function
int
main ()
{
  int n;			// Works only when n is odd
  printf ("Enter order of matrix (only odd)");
  scanf (%d, &n);
  generateSquare (n);
  return 0;
}