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What is the point of #define in c++ #ifndef headerfile_h #define headerfile_h and at the end of the file is #endif what is the purpose of this? 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.

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) I have been seeing code like this usually in the start of header files I've found that this works on gcc and clang by default:

#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. 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.

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

#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. #define _add_penguin(a) penguin ## a #define add_penguin(a) _add_penguin(a) #define width (100) #define height 200 add_penguin(height) // expands to penguin200 add_penguin(width) // error, cannot concatenate penguin and (100) same for stringization (#) Clearly this is a corner case and probably doesn't matter considering how width will presumably be used

Still, it is something to keep in. Maybe you got mixed up with the jsonp service dependency format, which uses require () to load the service, and then specify define () as the jsonp callback which will eventually define the module once the service responds So in the end, you use define () to define modules, and require () to load them.

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