/*
 *	factorial.c
 *	Douglas L. Jones
 *	University of Illinois at Urbana-Champaign
 *	August 28, 2012
 *
 *	(c) 2012 by Douglas L. Jones
 *	This work is made available according to the Creative Commons "Attribution" license
 *	http://creativecommons.org/licenses/by/3.0/
 *
 *  factorial.c: Computes the factorial of a positive integer
 *
 *  Developer notes:
 *
 *  User notes:
 *
 */
#include <stdio.h>

/* Declare constants */
#define START_COUNT 2

int main()
{
  /* Declare variables */
     int counter;	/* holds the current index in the factorial loop */
     int product;	/* holds the accumulating factorial product */
     int endCount;	/* holds the value of which to compute the factorial */

  /* Read in value of which to compute factorial */
     printf("This program will compute N!; enter N: ");
     scanf("%d", &endCount);
     printf("\n");

  /* Compute the factorial */
     product = 1;
     for (counter = START_COUNT; counter <= endCount; counter = counter + 1)
     {
       product = counter*product;
     }
        
/* Add patch for input = 0 ! */

  /* Print the answer */
     printf("%d\n", product);

     return 0;
}