I've now see the answer (and its obvious) for #8 and in that rare case the evaluation order doesn't actually matter since it won't affect anything but if it were anything else then I'd have to call shenanigans on you for the trick question since you'd only be testing on the implementation and not the specified language.
you'd only be testing on the implementation and not the specified language
Joke right? specified language? perl? ;-)
in any case... many other exercises (5, 7, 9a, 9b, 11, probably 10 too) also rely on undefined behavior, or at least their official answers do. It's considered acceptable for obfu and bizarre exercises :-)