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  1. What is the purpose of the #define directive in C++?

    May 10, 2010 · 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 …

  2. c++ - 'static const' vs. '#define' - Stack Overflow

    Oct 28, 2009 · 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?

  3. Why use #define instead of a variable - Stack Overflow

    May 14, 2011 · 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.

  4. c++ - Declaring a function using #define - Stack Overflow

    Jul 9, 2018 · The #define version is still a macro. The code is expanded at the invocation site. It has all the expected problems (with macros) including namespace pollution and unexpected …

  5. Difference between `constexpr` and `#define` - Stack Overflow

    Feb 12, 2021 · 23 So I read the interesting answers about what are the differences between constexpr and const but I was curious about are the differences between #define and …

  6. 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?

  7. Is there a way to do a #define inside of another #define?

    You could for example do an ifdef guard to initialize a variable in a macro but make sure it isn't declared twice. I'm sure there are other possible use cases. Besides, it's normal to give …

  8. 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 …

  9. How do I define a function with optional arguments?

    How do I define a function with optional arguments? Asked 13 years, 4 months ago Modified 1 year ago Viewed 1.2m times

  10. Array format for #define (C preprocessor) - Stack Overflow

    Array format for #define (C preprocessor) Asked 12 years, 9 months ago Modified 4 years, 3 months ago Viewed 96k times