Is super-accuracy matters?

[John Keith]

(10-06-2023 05:05 PM)Jlouis Wrote:  ... if one needs more exact results for professional use, just use a HP 50g in exact mode. After finishes the calculations, just press the the right keys and voila, you have numerical results with the accuracy needed.

That's what I do every day. You can also use Spigot or the Android calculator and get as many digits as you need. There are many applications for which speed is more important than provably exact results, where C/Java Doubles can be used. Problems only arise when one uses the wrong tool for the job at hand.