Fix the last compiler warning. Bah. A 26-line comment to explain a one-line change will not do any good for the code deletion metric of productivity. However, I have learnt something today: specifically, the arithmetic type conversion rules in C. Wow. I had been beginning to think that C programming wasn't so bad after all: simple, clean semantics, and very little going on under the hood; nothing there to help the programmer, but nothing much to actively get in the way. And then I spend an hour on this.