What symbols would appear within active preprocessor directives under a given configuration?
什么符号出现在活跃的预处理器指令在给定配置?。
Source files in the Linux subdirectory could have a code layout with preprocessor directives as follows.
linux子目录中的源文件中可能会有带有预处理程序指示符的代码形式，如下。
In the process, all preprocessor directives are carried out, macro expansions are performed, and comments are removed.
在此过程中，执行所有的预处理器指令，执行宏展开，并移除注释。
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