Programming C without variables is like, well, programming C without variables. They are so essential to the language that it doesn’t even require an analogy here. We can declare and use them as ...

That can certainly be stored within each struct as a member of the struct. However, I don't know why he'd need it at all given that he wants to store the rooms in an array; he can just do some math to ...

This is an excellent question. Zero-length arrays, also known as flexible arrays, are used to implement variable-length arrays, primarily in structures. That's a little confusing, so let's look at an ...