Why do lots of (old) programs use floor(0.5 + input) instead of round(input)? – stackoverflow.com

Why do lots of (old) programs use floor(0.5 + input) instead of round(input)? – stackoverflow.com

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The differences reside in the returned value giving inputs around tie-breaking I believe, such as this code: int main() { std::cout.precision(100); double input = std::nextafter(0.05, 0.0) / ...

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