Calculator code, you can realize a simple numerical calculation, the High function and other functions
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The sample Calculator code, Calculator.cs (see the download file), is a C# class with four methods (add, sub, mul, div).
样本 Calculator 代码 Calculator.cs （请参阅下载文件）是一个有 4 个方法（add、sub、mul 和 div）的 C# 类。
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.
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。
Listing 6 illustrates client code for invoking the calculator service.
清单6显示了用于调用计算器服务的客户端代码。
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