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Original post by LessBread
Declare the actual variable in one file and use extern in many other files to access it.

<pedantic>define the variable in one file and use extern declarations to access it from other files.

When you have just
long Var;
it's a definition and can only show up (in a given namespace scope) once in your entire program.

When you have
extern long Var;
it's a declaration and can show up in as many files or as many times in one file as you want.

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