Let's check your logic. If bread costs $2.00 but you only want to pay $1.00. You should steal the bread and leave the dollar. Yeah, that's legal right?

I agree that those types of questions are probably more about the interviewer's ego than finding the skill level of the applicant. But, that question made me think, a little.:doh: Consider this. All powers of 2, in binary are in the following form: 01, 10, 100, 1000, 10000 etc... which of course is 1, 2, 4, 8, 16, etc... So the easy way to tell is just any number that in binary is a single 1 followed by all zeros.