#include <stdio.h>

long fatorial (int n)
{
  int i ;
  long fat ;

  if (n <= 1)		// por definição
    fat = 1 ;
  else
  {
    fat = 1 ;
    for (i = 2; i <= n; i++)
      fat *= i ;
  }

  return (fat) ;
}

int main ()
{
  printf ("fat (10): %ld\n", fatorial (10)) ;
  return (0) ;
}