IS IT A BUG ????

["Srujan.K.V.S." <srujan at students dot iiit dot ac dot in>]

Hi,

	 The following is the program to print magic squares.I`m getting 
wierd output when i remove the printf statement "printf("a")" from the 
code. The required output is obtained by simply substituting that by 
putchar('\0'). I would be very glad if someone can let me know.
Please kindly help me regarding this.

Expecting an early rep,


Srujan.K.V.S


************************************************************************

//This is a simple program to design magic squares.
//A magic square is an arangment of numbers of numbers from 1 to n^2 such
// that any row, diagonal or column sums to the same. This program wil
 //work for only odd sized squares
#include<stdio.h>
#include<stdlib.h>
#include<math.h> 
main() {
        int n,x=1,i,j,k,p,r,t;
        scanf("%d",&n);
        printf("%d\n",n);
        p=n*n;
        int a[n][n];
        for(i=0;i<n;i++)
                for(j=0;j<n;j++)
                        a[i][j]=0;
        i=0;j=(n-1)/2;
        a[i][j]=1;// starting  1 int the first row central column. :)
        //We try to put the next number in the top left diagonal square
	//from the recent numbered square.
        //If we have already numbered , we then number the square just
	//below it.
        for(k=1;k<p;k++)
        {
                if((i-1)<0&&j!=0&&a[n-1][j-1]==0) i=n;
                if((j-1)<0&&i!=0&&a[i-1][n-1]==0) j=n;
                if(i==0&&j==0&&a[n-1][n-1]==0)
                {
                        i=n;j=n;
                }
                x++;
                if(a[i-1][j-1]==0)
                {
                        //The following printf statement if removed is 
alering the output when n=5
                        printf("a");

                        a[i-1][j-1]=x;
                        i=i-1;
                        j=j-1;

                }
                else
                {
                        if((i+1)>(n-1)) i=-1;
                        a[i+1][j]=x;
                        i=i+1;
                        j=j;
                }
        }
        for(i=0;i<n;i++)
        {
                for(j=0;j<n;j++)
                        printf("%4d \t",a[i][j]);
                printf("\n");
        }
}
*****************************************************************************