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*. h or *. hpp for your C++ headers class definitions another convention is to use h for C headers and hpp for C++; a good example would be the boost library Quote from Boost FAQ, File extensions communicate the "type" of the file, both to humans and to computer programs The ' h' extension is used for C header files, and therefore communicates the wrong thing about C++ header files
How does #include lt;bits stdc++. h gt; work in C++? [duplicate] Se e g GCC 4 8 0 bits stdc++ h source Using it would include a lot of unnecessary stuff and increases compilation time Edit: As Neil says, it's an implementation for precompiled headers If you set it up for precompilation correctly it could, in fact, speed up compilation time depending on your project
What is the difference between a . cpp file and a . h file? h files, or header files, are used to list the publicly accessible instance variables and methods in the class declaration cpp files, or implementation files, are used to actually implement those methods and use those instance variables The reason they are separate is because h files aren't compiled into binary code while cpp files are
c++ - lt;iostream gt; vs. lt;iostream. h gt; vs. iostream. h . . . - Stack Overflow An advantage of not using the h version: There are several reasons why new code should be written using the extensionless version of the header files instead of the h forms The first is the unpredictability of such code when compiled on modern compilers As previously mentioned, the result of using the h headers is implementation specific