Header file and extern keyword

Question

I am having a lot of issue using extern variable and header files. I have read through sections of books and searched the web for hours but I haven\'t been able to figure out. A

Answer 1

You defined gI inside the scope of the main() function, which makes it visible only from there. I suspect what you really wanted is a global gI variable (hence the extern int gI declaration).

If you want to have AnotherFunc() see it, move int gI = 0 outside, for instance in the same file than the definition of AnotherFunc().