extern int b;  /* external declaration */
/*extern int c;  /* Not possible, since c is "static" -> scope is only the file it resides in */
static int c = 2;
 
void f2() {
   b++;
   printf("in f2: external parameter b = %d\n", b);
}

void f3() {
   c++;
   printf("in f3: external parameter c = %d\n", c);
}

static void f4() { /* Notice this function is static */
	b++
}