Factorial

Reads a nonnegative integer and computes and print its factorial.
e.g n! = n.(n - 1).(n - 2).....1

/*
   title: Factorial
   coder: aeriqusyairi]
   date: dec30 2011
*/
#include<stdio.h>
#include<stdlib.h>

int main(){
   int a=0,b=0,factorial=1;
   printf("Input a nonnegative integer: "); 
   scanf("%d", &a);
   while(a != 0){
      factorial *= a;
      a--;
   }   
   printf("The factorial is %d.\n", factorial);
   system("pause");
   return 0;
}