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? Asked 15 years, 8 months ago Modified 10 months ago Viewed 51k times
The question is if users can define new macros in a macro, not if they can use macros in macros.
Which one is better to use among the below statements in C? static const int var = 5; or #define var 5 or enum { var = 5 };
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.
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.
#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.
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...
As the title says; what's the difference in practice between the inline keyword and the #define preprocessor directive?
As far as I know, what you're trying to do (use if statement and then return a value from a macro) isn't possible in ISO C... but it is somewhat possible with statement expressions (GNU extension). Since #define s are essentially just fancy text find-and-replace, you have to be really careful about how they're expanded. I've found that this works on gcc and clang by default:
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