[aidenn0]

Not true, !0 is always 1 in the C standard. Other parts are wrong though (they assume short is narrower than int, and that int is 32 bits).

[chc]

It's not wrong. If you read the intro, they note that those traits are implementation defined, so they say to assume you're using an implementation with those characteristics.

[nooop]

So this is incorrectly titled. This should be a "A Quiz About Integers in C on common x86 and x64 ABI."

Unfortunately this does not educate people to that kind of issues, which is very unfortunate.

[rcfox]

The assumptions are explicitly stated at the beginning of the quiz.

[matzahboy]

Thanks. I didn't know that