4*4 magic square.c

/*This code print only 4*4 magic square. It is a hardcode program.*/
#include<stdio.h>/*this program is done by myself without any assistance*/
# define SIZE 20
int main()
{ int i,j,i_no,temp, sum=0;
    int a[20][20];
    printf("Enter the initial value:  ");
    scanf("%d",&i_no);
    //first of all make a 4*4 matrix
    for(i=0;i<4;i++)
        for(j=0;j<4;j++)
            {
                a[i][j]=i_no;
                i_no++;
            }
    //Now to make magic square digonals values should be interchanged in the following order.
    //a[0][0] with a[3][3], a[1][1] with a[2][3], do the same thing in other digonal as well
    temp = a[0][0];
    a[0][0] = a[3][3];
    a[3][3]= temp;
    //a[1][1] with a[2][2]
    temp = a[1][1];
    a[1][1] = a[2][2];
    a[2][2]= temp;
    //a[0][3] with a[3][0]
    temp = a[0][3];
    a[0][3] = a[3][0];
    a[3][0]= temp;
    //a[1][2] with a[2][1]
    temp = a[1][2];
    a[1][2] = a[2][1];
    a[2][1]= temp;


        printf("\n Here is your 4*4 magic square: \n");
    for(i=0;i<4;i++)
    {
            for(j=0;j<4;j++)
                printf("%2d ",a[i][j]);
            printf("\n");
    }
    for(i=0;i==0;i++)
            for(j=0;j<4;j++)
                sum+=a[i][j];
                printf("\n\n");
    printf("\n\n Sum of any row or coloumn or digonal = %d\n",sum);
    return 0;
}