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

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 …

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 …

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 …

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...

How can I use #if inside #define in the C preprocessor? Asked 15 years, 8 months ago Modified 9 months ago Viewed 51k times

Feb 26, 2017 · The preprocessor does not go through the entire program, it has previously processed some input. Only past preprocessed input matters for the behavior of the …

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 …

Jun 19, 2016 · Preprocessor directives, such as #define and #ifdef, are typically used to make source programs easy to change and easy to compile in different execution environments. …

Mar 24, 2025 · For masochists, I provide a preprocessor macro that expands to expression that can be evaluated during compile-time to a boolean on newer C++ versions, depending on …