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  1. What does ## mean for the C(C++) preprocessor? - Stack Overflow

    Feb 20, 2016 · 6 because ## is a token concatenation operator for the c preprocessor. Or maybe I don't understand the question.

  2. Can Boolean operators be used with the preprocessor?

    FYI, identifiers/names, including preprocessor symbols, beginning with an underscore followed by a capital letter (or beginning with two underscores) are reserved to the implementation by the …

  3. What does preprocessing exactly mean in compiler

    Mar 14, 2016 · A preprocessor is an "engine" executed before the compiler compiles code. #define #include are preprocessor directives or macros, so the preprocessor engine executes …

  4. How can I use "else if" with the preprocessor #ifdef?

    In my project, the program can do one thing of two, but never both, so I decided that the best I can do for one class is to define it depending of a #define preprocessor variable. The following cod...

  5. Why should one bother with preprocessor directives?

    C preprocessor directives/macros are just another form of "meta-programming", albeit a relatively cruder form than is available in other languages. Preprocessor directives instruct the compiler …

  6. C preprocessor #if expression - Stack Overflow

    The preprocessor cannot use variables from the C program in expressions - it can only act on preprocessor macros. So when you try to use c in the preprocessor you don't get what you …

  7. gcc - How to view C preprocessor output? - Stack Overflow

    Sep 18, 2010 · How do I view the output produced by the C pre-processor, prior to its conversion into an object file? I want to see what the MACRO definitions do to my code.

  8. Define a preprocessor macro through CMake - Stack Overflow

    Jan 26, 2012 · How do I define a preprocessor variable through CMake? The equivalent code would be #define foo.

  9. When should I prefer constexpr variables over macros?

    To answer your question: If you are dealing with preprocessor already, I would use macros to keep clear and intuitive what is preprocessor and what is compilation time. I would also …

  10. c - Difference between macro and preprocessor - Stack Overflow

    Apr 2, 2016 · 4 Preporcessor: the program that does the preprocessing (file inclusion, macro expansion, conditional compilation). Macro: a word defined by the #define preprocessor …