include math.h for sqrt#14
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i believe gcc has historically just silently and implicitly included this header when needed, but at least in gcc 7.2, it will *complain* (not fail compilation, but complain) that you're using sqrt without including math.h - which is supposed to be included for using the function anyway.
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i believe gcc has historically just silently and implicitly included this header when needed, but at least in gcc 7.2, it will complain (not fail compilation, but complain) that you're using sqrt without including math.h - which is supposed to be included for using the function anyway.