No, you get room for one more negative int. x = x < 0 ? -x : x; is a common buggy abs(), e.g. when printing an integer. One should test if it's negative, perhap

No, you get room for one more negative int. x = x < 0 ? -x : x; is a common buggy abs(), e.g. when printing an integer. One should test if it's negative, perhaps print the '-', and then ensure it's negative for the rest of the per-digit code.