This is rather trivial, but I'm curious to see whether or not anyone has any interesting approaches to this. I also thought I would throw in an actual programming diversion for a change as well. The problem: give an input long integer (let's assume positive, but I'd also be interested in discussing the ramifications if any of considering negatives), return the position of the long's most significant bit (MSB). For ease, I guess we can keep the count zero-based. Therefore, if we want the MSB of 7, the answer would be 2.
The leftmost one bit, the MSB, is in the 2^2 position, so the MSB of 7 is 2.