These aren't hacks really: they're just basic operations in binary arithmetic that anyone who has seriously coded C or assembly must have bumped into, probably

These aren't hacks really: they're just basic operations in binary arithmetic that anyone who has seriously coded C or assembly must have bumped into, probably quite early. Other's have already mentioned but for real hacks in the unintuitive sense, check out Hacker's Delight and http://graphics.stanford.edu/~seander/bithacks.html http://graphics.stanford.edu/~seander/bithacks.html.