global variables in c++

Hi,
I was wondering how to create a variable in one file and then use it in all the files without the redeclaration of the variable with extern in every file that uses it.

I have seen this so I know that it is possible but I don't know how it was implemented.

Does anyone have a suggestion?

Regards,
Domen

Make your global var in a .cpp file, then redeclare that variable in a header with "extern" before. Don't initalize it in the headerm though:

Code:

---

// in .cpp:
int my_int = 50;
// in .h:
extern int my_int;

---

Thanks for the quick reply. This was exactly what I was looking for :)