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

If you #include the .cpp files, you will probably end up with loads of "multiple definition" errors from the linker. You can in theory #include everything into a single translation unit, but that also means that everything must be re-built every time you make a change to a single file. For real-world projects, that is unacceptable, which is why we have linkers and tools like make.