I don't like C for loops, either, but this can happen with other types of for loops, either. E.g. in Pascal: for i := 0 to len-1 do begin ... end This is co

I don't like C for loops, either, but this can happen with other types of for loops, either. E.g. in Pascal: for i := 0 to len-1 do begin ... end This is counting up, not counting down, and len-1 is still going to be either 2^k-1 or result in an error when you're using unsigned integers. While loops also don't fix it (not to mention that they have their own problem, such as forgetting or misplacing the iteration step). The primary issue is that len-1 is underflowing. Yes, you can avoid calculating len-1, but by that token, no error is ever a problem, because they can all be avoided with enough diligence and foresight. In that universe, Heartbleed never happened and the Ariane 5 never blew up. It is, however, not the world we live in.