/*#########################################################################################################*/
/* lab5drv.c                                                                                          */
/* This is the C Driver Program for the Factorial Function                                                 */
/* If you input a number it will print the Factorial of that number.                                       */
/* Note: global_var is the global variable and num is a variable local to main                             */
/* You will need to use the stack for the local variable local_var of the function Fact().                 */
/* Please try the program for inputs <= 16. Program fails for inputs greater than 16 as a result of        */
/* large size of the result. 
/*########################################################################################################*/

#include "stdio.h"

int main(void);
void Fact(void);

int global_var; // This is the global variable 

int main(void){  
  int num;
  printf("Please Enter a Number:\n");
  scanf("%d",&num);
  global_var=num;
  Fact();
  if (global_var==-1)                // In case the input is negative, this check will take care of negative inputs
    printf("Invalid Input\n");
  else
    printf("The Factorial is %d \n",global_var);
}