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
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
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
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
Good Programming Practices for Macro Definitions (#define) in C For example, never define a macro like this: #define DANGER 60 + 2 This can potentially be dangerous when we do an operation like this: int wrong_value = DANGER * 2; Expecting 124 Instead, def