1/*
2 Copyright(C) 1998
3 All Rights Reserved. Salih Yurttas, ZCubes, BitsOfCode Software Systems, Inc..
4
5 Permission to use, copy, modify, and distribute this
6 software and its documentation for EDUCATIONAL purposes
7 and without fee is hereby granted provided that this
8 copyright notice appears in all copies.
9
10 date : January 1, 1998.
11 author : Salih Yurttas.
12
13 factorial.cpp
14*/
15
16
17long factorial(long n) {
18 if(n<0) return -1;
19 else if(n==0) return 1;
20
21 long a = 1;
22
23 for(int i=1; i<=n; ++i)
24 a *= i;
25
26 return a;
27}