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(C++) "header in multiple files" question

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Correct me if I'm wrong but it seems that if I were to declare a variable (not a member variable, mind), like: int a; inside a header - then I wouldn't be able to include that header in more than one sourcefile (because of redefinition errors). Is this correct?

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Yes.

But headers aren't the place for variable definitions, only declarations. To declare (but not define) "int a", we would place "extern int a;" in the header, and "int a;" or "int a = /*value*/;" in one source file.

However, typically this is a bad idea, as "a" is then a global variable.

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