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Yes, it should be included in all source files that need to use that structure.

You need to include whatever header file "person" was defined in.

There is nothing at all that would prevent you from doing what you described. That's why we need to see an example which doesn't work, so we can point out what you did wrong.

Prototypes are just...

You should post the code that doesn't work instead of the code that works. How exactly are the functions split up? Which header files are the prototypes defined in? Are you including those header...