alt Hacker NewsIn some sense, and without the interviewer knowing, that is actually a great scenario for an interview.
If you can convince someone in a position of authority that they’re wrong about something technical without upsetting them then you’re probably a good culture fit and someone who can raise the average effectiveness of your team.
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I know I did recommend someone after the interview because I looked it up and they were right. Great person to work with. Though I fully understand why most would hesitate.
The best interview questions spawn discussions. This is a pretty good one for that. We could dive into what makes it UB, why a particular compiler might do it a certain way, what results we'd likely see from other compilers, and why the standard might say that this sort of thing is UB.
"What does this produce?" and expecting an answer of "17" is a bad question even if UB didn't mean the expected answer is wrong.
Or, also, in the reverse direction, if the interviewer is wrong about it and can't be convinced otherwise, it's probably not a great place to work.