where should “include” be put in C++

Question

I\'m reading some c++ code and Notice that there are "#include" both in the header files and .cpp files . I guess if I move all the "#include" in the fi

Answer 1

While a header file should include only what it needs, "what it needs" is more fluid than you might think, and is dependent on the purpose to which you put the header. What I mean by this is that some headers are actually interface documents for libraries or other code. In those cases, the headers must include (and probably #include) everything another developer will need in order to correctly use your library.