第二周上机任务2-1---用自定义函数实现求阶乘（组合数求解）

实验目的：组合数求解

实验内容：用自定义函数实现求阶乘
* 程序头部注释开始
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
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