Thread: make variables visible on multiple files

Declare the variable in one file globally. In the other file declare the same variable globally as well but put the extern keyword specifier in front of everything:

file1:

Code:

int myvar;

file2:

Code:

extern int myvar;

In the cpp file declare it normally. In the header file (which you include in all other files that wants to access it) you declare it using extern (see above post).

>can I declare a variable with a scope that's wider than the "file" level?
No, but you can include declarations in each file that you intend to use the variable and define it in a single location so that the linker continues to like you.

>a friend of mine that used to be a professional c programmer weren't able to give me an answer
That's odd. That's very odd. I would expect a professional to be familar with handling multiple file programs.

Pfft. Who needs multiple files? It just takes me ten minutes to find the missing semicolon in my hundred-thousand lines of code.