C Programming - Declarations and Initializations - Discussion

//SATHISH explanation was correct!..
int main()
{
printf(" %d",root());
printf(" %d",root());
}

int root()
{
static int i;
i++;
return i;
}

BY DEFAULT ,ANY INTEGER OR STATIC INT VARIABLE VALUE IS ZERO.
BUT WHEN EACH TIME THE FUNCTION WAS CALLED ,THE DIFFERENCE OF NORMAL INT AND STATIC INT CAN BE SEEN.
IF THE "i" HERE IS NORMAL INTEGER IT WILL JUST RETURN ALWAYS VALUE "1" ,EVERY TIME IT IS CALLED .
BUT THE STATIC VARIABLE WILL HOLD PREVIOUS VALUES OF "i".EVERY TIME WHEN THE FUNCTION IS CALLED IT WILL THE PREVIOUS VALUES ARE RESTORED.

Can static variables be declared before main() ?

What are linkages?

Where do we use this linkages.

@satish-thanks a lot...but why the term linkage is used for this storage classes?

@shan and @komal
external - throughout the program
internal - a single file
none - local to a single function

static example..
int main()
{
printf(" %d",root());
printf(" %d",root());
}
int root()

{

static int i;
i++;
return i;
}

it will print the updated value every time example: o/p=1 2 3 4...


where as if we use int i in the place of static int i, in the root function.. always print 1 1 1 1

Tell me more about static variables???

I want example program for three linkages.

I wanna a briefly explain about the linkages.