The C programming language K&R 书中有这么一段话：
Nonetheless, macros are valuable. One practical example comes from <stdio.h> , in which
Nonetheless, macros are valuable. One practical example comes from <stdio.h> , in which
阅读背景：
K&R中 宏可以节省运行时函数调用的开销。这句话如何理解呢？
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