There was a question for less than $1,000 that could have given us Ada programmers some difficulty because we know too much. It was
Which of the following is NOT an integer?
(A) 1 (B) 2 (C) 1/2 (D) -1
The contestant answered "C" and was right. But suppose the contestant had said, "-1 is a simple expression, so it isn't an integer. (It isn't even a number.) That's my final answer."