I'm with Rob, I got this one right (for once!) but often it's these little details that let me down in these questions. Different data type can completely change what is going on. The name of the question is very much like the scenario Rob mentioned too. Sometimes you take a look at a problem with preconceptions, and it can throw you for a while because everything in the logic is screaming at you that it's correct and yet... well I thought it was a good question because it is a lesson not just in bit fields but in taking in all the details and not taking anything for granted.