[adr_]

I've forgotten when I learned this stuff. Recently, I've been teaching people who have been programming for years how to reverse engineer. It's surprising how much trouble they have grasping trivial operations like "a & a" or "b ^ b", and understanding arithmetic equivalents, like using "a << 2" to multiply by four. Two's complement also seems to challenge a lot of people - I suppose an intuitive understanding comes with time, but I'd expect people to pick that up if they've been writing C for a while.

I do feel that this poll is biased, because people prefer to declare their knowledge than admit their ignorance.