I don’t mean to complain that ‘Someone on the Internet is Wrong’ (http://xkcd.com/386/) but hopefully this is informative to someone. I do also mean to make the point that, yes, I agree: I do not know C, you do not know C, and we do not know C, as it would seem C is unknowable… but then, the same could be said of JavaScript and of many other languages.

Regarding Q9, the answer is indeed 0, but note the words of the C99 standard: “For unsigned integer types other than unsigned char, the bits of the object representation shall be divided into two groups: value bits and padding bits (there need not be any of the latter).” I am not sure of the situation in C90.