Thread: external variable

I want to be able to declare a global variable in a header/source file and then use it in some other source file which has #included it, like

Code:

sth1.c
-----------
int integer;


sth2.c
----------
#include <stdio.h>
#include <sth1.c>

char* main ()
{
	ineger = 45;
	printf("%d", integer);

	return "o-|-<";
}

I looked around in some files like errno.h and could find the "extern" keyword plus other crazy stuff like _RTLENTRY, _EXPFUNC and _UNDERSCOREZZ.
I looked around some and it seemed to me that extern does what I want, but it didn't work. I would get

Code:

Error: Unresolved external '_integer' referenced from sth.obj

Compiler: bcc32 5.6.1