connection between variables in different files

Dear Sir

i want to use with variables that defined at the main, at the file of functions.
i try to add extern to the variables, but it send me an error massege like: non address/-constant initializer.

when i added the sign "()" after the name of the variables i accept an error massege like: error L102: external attribute mismatch

and

error L118: reference made to erroneous external

how can i correct in

thank you

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