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Because I've made .cpp files then transfered them into .h files, the only difference I can find is that you can't #include .cpp files. Is there any difference that I am missing?
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A good rule of thumb is ".h files should have declarations [potentially] used by multiple source files, but no code that gets run."
By convention, .h files are included by other files, and never compiled directly by themselves. .cpp files are - again, by convention - the roots of the compilation process; they include .h files directly or indirectly, but generally not .cpp files.