A Number's Spiral.... in C

Hello again,

Recently, I had my Computer Programming online test... For that I was practising coding in C.. I am giving one of my program code.. which will display numbers in a spiral fashion...

For example, if you give input as 5 then the output would be:
01 02 03 04 05
16 17 18 19 06
15 24 25 20 07
14 23 22 21 08
13 12 11 10 09

Hope, you will find it interesting...

//This spiral program is made by Neeraj Agarwal.
#include

int main()
{
 int i, j, k, l, m, n, o, p, q, r, s, sq;
 int f[20000];
 char fl;
 printf("Enter a number : ");
 scanf("%d",&n);
 sq = n * n;
 for(j=1;j<=sq;j++)
  f[j] = 0;
 i=1;
 fl = 'f';
 l = 1;
 while(l<=sq)
 {
    if(fl == 'f')
    {
     f[i] = l;
     i = i + 1;

     if(f[i]!=0 || (i-1)%n == 0)
     {
       i = i - 1 + n;
       fl = 'd';
     }
     l++;
    }
    else if(fl == 'b')
    {
     f[i] = l;
     i = i - 1;
     if(f[i] != 0 || (i+1)%n==0)
     { 
      fl = 'u'; 
      i = i + 1 - n;
     }
     l++;
    }
    else if(fl == 'u')
    {
     f[i] = l;
     i = i - n;
     if(f[i] != 0 || i%n==0)
     { 

      fl = 'f'; 
      i = i + n + 1;
     }
     l++;
    }
    else if(fl == 'd')
    {
     f[i] = l;
     i = i + n;
     if((f[i] != 0 || i>sq))
     { 
      fl = 'b'; 
      i = i - n -1;
     }    
     l++;
    }
 }
 for(j=1; j<=sq; j++)
 {
  if((j-1)%n==0)
   printf("\n");
  if(f[j]<=9)
  {
   printf("0%d    ",f[j]);
  }
   else 
    printf("%d    ",f[j]);
 }
 return 0;
}

Byee...