#include <stdio.h>

main ()

{
   int n, i = 0;


   printf ("Please enter the value of n: ");
   scanf ("%d", &n);

   if (n >= 0)  {

      while (n >= 0) {     /* output all n factorials */

         printf ("factorial (%d) = %d\n", i, factorial (i));
         i = i + 1;
         n = n - 1;
      }
   }

   else 

      printf ("factorial of a negative number is undefined\n");
}


/* factorial function computes n! for nonnegative n */

int factorial (int n)

{
   int ans = 1;


   while (n > 1)  {

      ans = ans * n;
      n = n - 1;
   }

   return ans;
}