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

You can pass the argument as a pointer to allow the function to modify it without using the return value:

void multiples_of_2(int *i)
{
    *i += 2;
}

And call it:

int i = 0;
multiples_of_2(&i);