2025年3月11日 · Macros in C are symbolic names defined using the #define directive that represent values or code snippets, allowing for code substitution during preprocessing, and can be categorized into object-like, chain, multi-line, and function-like macros.

Macro arguments are completely macro-expanded before they are substituted into a macro body, unless they are stringified or pasted with other tokens. After substitution, the entire macro body, including the substituted arguments, is scanned again for macros to be expanded.

2018年6月2日 · 本文详细介绍了C语言中的宏定义，包括对象形式的宏、函数形式的宏、参数转化为字符串、连接符号用法、变长参数及预定义宏变量和常用宏命令的应用。 参考： https://gcc.gnu.org/onlinedocs/cpp/Macros.html. gcc编译过程一般分为预处理，编译，汇编，连接四个阶段。 宏定义在预处理阶段就会被展开。 由于预处理器并不认识c预留关键字，所以绝大部分合法的标识符都可以被定义为宏，比如我们可以重定义const的含义。 只有define关键字和c++ …

To preserve the pass-by-reference C paradigm, you should call my_function this way: int output_err; my_function(num, &output_err); This way, later, if you decide to make my_function a real function, you don't need to change the call references.

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There are two kinds of macros. They differ mostly in what they look like when they are used. Object-like macros resemble data objects when used, function-like macros resemble function calls. You may define any valid identifier as a macro, even if it is a C keyword. In the preprocessing stage, GCC does not know anything about keywords.

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