/***************************************************************************
 *
 * 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;
}