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- Is it possible to use a if statement inside #define?
It is possible to use anything in #define - you just need to be careful about the preprocessor See @Saeed's answer below
- 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?
- 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++ - 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# - How do you use #define? - Stack Overflow
The main use-case for #define is for conditional compilation (where it can be very useful) You're correct that using #define for symbols and (please don't do it) macros, is not a good use-case
- Why are #ifndef and #define used in C++ header files?
I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of the file is #endif What is the purpose of this?
- 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
- Defining and using a variable in batch file - Stack Overflow
The space before the = is interpreted as part of the name, and the space after it (as well as the quotation marks) are interpreted as part of the value So the variable you’ve created can be referenced with %location % If that’s not what you want, remove the extra space (s) in the definition
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