factorial

This functionality works well as a recursive application, as shown in the sample factorial function in Listing 4.

这个功能作为递归应用程序工作良好，如 清单 4中的样本阶乘函数所示。

Here is an implementation of a factorial calculator, where we use a conventional technique of calling a second, nested method to do the work.

这里是一个阶乘计算器的实现，我们会使用一种常规的方法，通过调用第二个，嵌套的方法来完成计算。

The test case consists of some simple command argument processing followed by a loop that calculates the factorial of the specified values (if any).

测试用例包含几个简单的命令参数处理，然后是一个循环，它计算指定值（如果有的话）的阶乘。