A simple slide rule program
For those of you who don't know, a slide rule is a mechanical calculator. This works just like a simple 5 scale slide rule. (A,B,C,D,K) Slide rules are outdated and though simple, are actually quite ingenious devices, using logarithmic scales. I urge you to figure out how it works. Something like: http://en.wikipedia.org/wiki/Slide_rule Arrow keys or mouse click and drag to move middle bar.