Have you considered using fixed-point arithmetic? For example: 7.1s2 roundTo: 0.1s2
The rule of thumb I stick to is to use FP only if I know the inaccuracies won't bite me. Funny enough, both 7.1 and 0.1 are already not accurately representable as floats. (And by coincidence, I prepared exam questions about floats for my students yesterday. ) Kind regards, Steffen Konrad Hinsen schrieb am Dienstag, 15. Juni 2021 07:02:30 (+02:00): > On 15/06/2021 01:03, Esteban Maringolo wrote: > > Sure, but what initiated this thread was a reference to roundTo: 0.1 > > which produced a "wrong" output. > > > > (9.1 + (-2.0)) roundTo: 0.1 "=> 7.1000000000000005" > > 7.1 roundTo: 0.1 "=> 7.1000000000000005" > > > > However, at this point I know that Pharo "does the right, raw, thing" > > (at least compared to other mainstream languages), but it still > > produces a surprise effect. > > That's the "floating point surprise" that everyone has at some point, no matter the language and runtime system. If that surprise is a problem for you, are you sure that floating-point arithmetic is what you really want? Maybe your needs are better served with integers and fractions. > > > Konrad. > > -- Gesendet mit Vivaldi Mail. Laden Sie Vivaldi kostenlos von vivaldi.com herunter.
