C: Looping without using looping statements or recursion

Question

I want to write a C function that will print 1 to N one per each line on the stdout where N is a int parameter to the function. The function should not use while, for, do-while

Answer 1

N is not fixed, so you can't unrole the loop. And C has no iterators as far as I know.

You should find something that mimics the loop.

Or thinking outside the box:

(for example N is limited to 1000, but it is easy to adapt)

int f(int N) {
    if (N >= 900) f100(100);
    if (N >= 800) f100(100);
    if (N >= 700) f100(100);
    ...

    f100(n % 100);
}

int f100(int N) {
    if (N >= 90) f10(10);
    if (N >= 80) f10(10);
    if (N >= 70) f10(10);
    ...

    f(n % 10);
}

int f10(int N) {
    if (N >= 9) func();
    if (N >= 8) func();
    if (N >= 7) func();
    ...
}