/***************************************************************************
 *
 * Purpose: generate the factorial of a number by recursion
 * Author:  M. J. Leslie
 * Date:    09-Apr-94
 *
 ***************************************************************************/

#include <stdio.h>

int factorial(int num);

main()
{
  int num;
  puts  ("This program will return the factorial of a number.");
  printf("Please enter the number ==> " );
  scanf("%d", &num);

  printf(" %d! is %d\n",num, factorial(num) );
}

int factorial(int num)
  {
  int ans=1;
  if (num == 1 ) return;
  ans = num * factorial(num-1);
  return ans;
}