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C++ newbie question: splitting large C++ file

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Hi everybody. I'd like to have some info on how to split a large c++ file. For example, just imagine i have a main.cpp file as follows: int x=3; ...... void function1() { x=x+5; } I'd like to move the function1() to another extra.cpp file, so here it goes my question: i do i access variable that are in the main.cpp ? Do i have to write a header file ? Thx and excuse me for this newbie questions, just learning c++ ...

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You have to write a header file where you declare (but do not define) function1, which you then implement in a separate source file. If you need x to be accessible from both compilation unit it must be declared extern in the header, but this is usually a terrible idea; you should always strive to avoid global variables.

See also: Kylotan's guide

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