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In other words, when the compiler starts building your code, no #define statements or anything like that is left. A good way to understand what the preprocessor does to your code is to get hold of the รขโฌยฆ The question is if users can define new macros in a macro, not if they can use macros in macros.
Asked 15 years, 8 months ago modified 9 months ago viewed 51k times The #define directive is a preprocessor directive; The preprocessor replaces those macros by their body before the compiler even sees it. Think of it as an automatic search and replace of your source code.