What's the difference between using extern and #including header files?

Question

I am beginning to question the usefulness of \"extern\" keyword which is used to access variables/functions in other modules(in other files). Aren\'t we doing the same thing whe

Answer 1

No. The #include is a preprocessor command that says "put all of the text from this other file right here". So, all of the functions and variables in the included file are defined in the current file.