//Definition for variable that cannot be mentioned in any other .C file
//of the same program.
static int i = 10;

//A const variable is ipso facto static in the above sense.
const int j = 20;

//Definition for variable that could be mentioned in other .C file(s)
//of the same program.
extern const int k = 30;

//Definition for function that cannot be mentioned in any other .C file
//of the same program.

static int f(int i)
{
	return 2 * i;
}