In my humble opinion the only challenge here is guessing what sizeof(int) the author had in mind. A mild challenge would be asking about something that is not a

In my humble opinion the only challenge here is guessing what sizeof(int) the author had in mind. A mild challenge would be asking about something that is not a part of the pointer arithmetic basics such as a[i] === i[a] and obfuscating a bit (e.g. "const char* i[] = {"Hello","world"}; char c = (2&*i[1])["Hello world"]; what is c? The guess about character encoding is as good as the guess about sizeof(int)).