How can I return more than one value through function in C?

Question

I have been asked in an interview how one can return more than one value from function. I have answered saying by using pointers we can achieve(call by reference) this in C.

Answer 1

There are a few ways:

1. Return value using the return statement (as you already know)
2. Return via references.
3. Return values via the heap.
4. Return values via global variables.