"Sometimes there really is an answer that is correct, and in those cases anything less than perfection is just sloppy." Anytime there is a correct answer, and

"Sometimes there really is an answer that is correct, and in those cases anything less than perfection is just sloppy." Anytime there is a correct answer, and it can be determined exactly (+, -, *, /, sqrt) you should expect nothing less than perfection. ceil, round, and floor fall into this category fairly self-evidently, I think.