您可以使用键盘输入这些表达式，然后观察expr的工作，现在您已经有了足够的知识来修改该计算器代码，以添加支持这些函数的按钮。
You can use the keyboard to type these in and see expr work; and you should have enough knowledge now to modify the calculator code to add buttons that support these functions.
清单6显示了用于调用计算器服务的客户端代码。
Listing 6 illustrates client code for invoking the calculator service.
清单11展示了对于使用隐含的资源(Implied Resource)模式访问计算器服务所需的客户端代码的更新。
Listing 11 shows the updates to the client code needed to access the calculator service using the Implied Resource pattern.
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