/* Iterative calculation of factorials. */

#include <stdio.h>

int fak( int n )
{ 
  int r; int i;

  r = 1;
  i=1;
  while ( i<n ){
    r = r*(i+1);
    i++;}
  return r;
}

int main()
{
  printf("fak(4) = %d. \n", fak(4));

}