How would one implement Lazy Evaluation in C?

Question

Take for example,

The follow python code:

def multiples_of_2():
  i = 0
  while True:
    i = i + 2
    yield i

How do we translate thi

Answer 1

int multiples_of_2() {
    static int i = 0;
    i += 2;
    return i;
}

The static int i behaves like a global variable but is visible only within the contect of multiples_of_2().