C Program to Generate Magic Square

Here's a C program to generate magic square with output. This program uses C concepts like GOTO statement, Modulus in C,  Multidimensional Arrays, IF-Else Condition, For loop and Nested Loops.

What is Magic Square? A magic square of order n is an arrangement of n² numbers, usually distinct integers, in a square, such that the n numbers in all rows, all columns, and both diagonals sum to the same constant.

Magic Square

# include <stdio.h>
# include <conio.h>

void main()
{
int n, i, j, c, a[9][9] ;
clrscr() ;
printf("Enter the size of the magic square : ") ;
scanf("%d", &n) ;
if (n % 2 == 0)
{
printf("\nMagic square is not possible") ;
goto end ;
}
printf("\nThe magic square for %d x %d is :\n\n", n, n) ;
j = (n + 1) / 2 ;
i = 1 ;
for(c = 1 ; c <= n * n ; c++)
{
a[i][j] = c ;
if(c % n == 0)
{
i = (i + 1);
goto loop ;
}
if(i == 1)
i = n ;
else
i = i - 1 ;
if(j == n)
j = 1;
else
j = j + 1 ;
loop : ;
}
for (i = 1 ; i <= n ; i++)
{
for (j = 1 ; j <= n ; j++)
{
printf("%d\t", a[i][j]) ;
}
printf("\n\n") ;
}
end : ;
getch() ;
} 

Output of above program

Enter the size of the magic square : 3

The magic square for 3 x 3 is :

8         1         6

3         5         7

4         9         2