c++ - What does ## in a #define mean? - Stack Overflow 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 preprocessed output and look at it
What is the purpose of the #define directive in C++? 0 in C or C++ #define allows you to create preprocessor Macros In the normal C or C++ build process the first thing that happens is that the PreProcessor runs, the preprocessor looks though the source files for preprocessor directives like #define or #include and then performs simple operations with them
c++ - Why use #define instead of a variable - Stack Overflow What is the point of #define in C++? I've only seen examples where it's used in place of a "magic number" but I don't see the point in just giving that value to a variable instead
Why do most C developers use define instead of const? #define simply substitutes a name with its value Furthermore, a #define 'd constant may be used in the preprocessor: you can use it with #ifdef to do conditional compilation based on its value, or use the stringizing operator # to get a string with its value
c - #Define VS Variable - Stack Overflow #define WIDTH 10 is a preprocessor directive that allows you to specify a name (WIDTH) and its replacement text (10) The preprocessor parses the source file and each occurrence of the name is replaced by its associated text
c++ - static const vs. #define - Stack Overflow Is it better to use static const variables than #define preprocessor? Or does it maybe depend on the context? What are advantages disadvantages for each method?