It evaluates to false in VW too. I guess it is a matter of internal representation, since ScaledDecimals/FixedPoints are a Fraction after all.
What is weird, and I'd say wrong (at least from the UX perspective) is that in Pharo (and Dolphin): ((91 - (2 * 35.9) - (0 / 2) * (113/121)) roundTo: 0.1) -> 17.900000000000002 While in VW and VAST they round the float properly: ((91 - (2 * 35.9) - (0 / 2) * (113/121)) roundTo: 0.1) -> 17.9 Regards! Esteban A. Maringolo On Tue, Sep 1, 2020 at 1:24 AM jtuc...@objektfabrik.de <jtuc...@objektfabrik.de> wrote: > > Interesting. Your expression evaluates to true in VA Smalltalk. > > > Am 01.09.20 um 06:17 schrieb Esteban Maringolo: > > As a follow up to this, adding a roundTo: before converting into a > > ScaledDecimal does not work. > > > > (((91 - (2 * 35.9) - (0 / 2) * (113/121)) roundTo: 0.1) > > asScaledDecimal: 1) = 17.9s1 > > > > So how do you compare two ScaledDecimals that _should_ be the same? > > > > Regards! > > > > Esteban A. Maringolo > > > > On Tue, Sep 1, 2020 at 1:07 AM Esteban Maringolo <emaring...@gmail.com> > > wrote: > >> Hi, > >> > >> I was doing some basic calculations based on a formula, and I wanted > >> to convert the result to a scaled decimal in order to avoid having > >> these "loose" decimals in 10th position or something similar. > >> > >> So I did the following: > >> 82 - (2 * 35.9) - (0 / 2) * (113/121) asScaledDecimal: 1 -> 9.5s1 > >> > >> But When I do this in a test: > >> (82 - (2 * 35.9) - (0 / 2) * (113/121) asScaledDecimal: 1) = 9.5s1 > >> > >> It fails because the comparison returns false. > >> > >> I guess this is the proper behavior, but I'd expected that the > >> conversion from a Float to a scaled decimal would have eliminated the > >> extra precision from the formula. > >> > >> I can do a roundTo: 0.1 before converting, but I'd like to know what > >> would be the proper way of dealing with this. > >> > >> Thanks! > >> > >> Esteban A. Maringolo > > > > -- > ----------------------------------------------------------------------- > Objektfabrik Joachim Tuchel mailto:jtuc...@objektfabrik.de > Fliederweg 1 http://www.objektfabrik.de > D-71640 Ludwigsburg http://joachimtuchel.wordpress.com > Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1 > > >
