3 ms·

the quiz asks what each one would evaluate to. “Undefined” or “implementation dependent” are not answers to that question. “I don’t know [because it is undefine

• mort96 7y ago
  Ok, say I made a quiz where I ask you about what `((((16 <= 16) << 16) >> 16) <= 16)` evaluates to. I could give you the options 0, 1, 16, or "I don't know". If I as a quiz author wanted to test your knowledge about shift operators and esoteric uses of equality operators and your ability to reason through an expression, I would mark "1" as correct, and "0", "16", and "I don't know" as incorrect (I would include the "I don't know" option just because that's a common thing to do in quizzes, to not force people to guess one of the options if they don't actually know the answer). My point isn't that there's no logically consistent answer. My point is that there are _two_ logically consistent answers, and which one is correct depends on the unknowable state of mind of the quiz author. On the other hand, if the options included "It's implementation defined" or "it's undefined", the author would have made their expectations clear, and the quiz would actually test people's knowledge of C rather than people's ability to try to reason about what sort of answer the author expects.