Another way to get a feeling for the error (simpler than fully fledged interval arithmetic) is to toggle the rounding rules from the usual (towards even, or so)

Another way to get a feeling for the error (simpler than fully fledged interval arithmetic) is to toggle the rounding rules from the usual (towards even, or so) to up and down, and observe the change in result. https://en.wikipedia.org/wiki/IEEE_754#Rounding_rules https://en.wikipedia.org/wiki/IEEE_754#Rounding_rules