[bregma]

Ah, yes. Cardinal numbers and ordinal numbers both end in the word "numbers" so they're the same thing. No need to distinguish between having three apples and having the third apple.

[Old_Thrashbarg]

If you ask most people to just label their apples, they'd call the first one "1", and so on. Very few people would say, "please pass me apple #0".

[goatlover]

And if someone did say that to me, I would pass them no apple, since that's how we use everyday language. And if I knew they were a programmer, I'd first ask them in which programming language they'd wish me to pass the apple.