Program to generate magic square Using C

# include<stdio.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() ;
}

RUN 1 :
~~~~~~~
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
RUN 2 :
~~~~~~~
Enter the size of the magic square : 4
Magic square is not possible