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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
How can I use #if inside #define in the C preprocessor? Just do something like this: #ifdef USE_CONST #define MYCONST const #else #define MYCONST #endif Then you can write code like this: MYCONST int x = 1; MYCONST char* foo = "bar"; and if you compile with USE_CONST defined (e g , typically something -DUSE_CONST in the makefile or compiler options) then it will use the consts; otherwise it won't
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
What is the difference between #define and const? [duplicate] 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 A const variable declaration declares an actual variable in the language, which you can use well, like a real variable: take its address, pass it around, use it, cast convert it, etc Oh
What is the scope of a #define? - Stack Overflow What is the scope of a #define? I have a question regarding the scope of a #define for C C++ and am trying to bet understand the preprocessor Let's say I have a project containing multiple sour
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?