hello.c

int gx = 1, gy = 2; // global variable

int func(int a ,int b) {
	int lx, ly;
	gx = a;
	gy = b;

	lx = 9;
	ly = 3;

	return gx + gy + lx + ly;
}

int main(int argc, char const *argv[])
{
	int ans = 999;
	ans = func(2, 9);
	return 0;
}