For example, let's say that you wanted to create a macro that introduced a variable into a scope that could be used by the person calling the macro.

例如，假设您希望创建一个宏，它将一个变量引入调用宏的人可以使用的范围中。

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The inclusion of iostream and the definition of the EXPORT_API macro can be considered code-invariant parts of the file throughout the scope of the project.

其中包含了iostream和export_api宏的定义，在该项目的范围内，这些可以被看作是该文件中不变的代码部分。

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It can improved programme efficiency with using macro program. And it can extended using scope of nc machine tool.

使用宏程序可以极大地提高编程效率，并能扩展数控机床的使用范围。

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