There’s no rounding as such involved in the formulae. The timing will only matter if total_amount changes between the two calculations, which I assume it will not do. If x/2, when x is an integer (be it number of cents or number of pennies or whatever), does not give identical results for the same x whenever it is executed, something is seriously wrong.
If x is a floating point number, odd things can happen. Even so, for the same x, the result must be constant. The developers should be able to clarify all of this. Peter -- Peter West p...@pbw.id.au “Blessed are you among women, and blessed is the fruit of your womb!” > On 21 Dec 2020, at 9:24 pm, Fred Bone <fred.b...@dial.pipex.com> wrote: > > On 21 December 2020 at 12:12, Peter West said: > >> I don’t understand why "total_amount-(total_amount/2)” doesn’t work. >> I’m assuming that two formulae are used: total_amount/2 & >> total_amount-(total_amount/2), as the OP specifies. >> >> If the amount is odd, the first should be (given consistent truncation of >> the dividend by integer division) equivalent to (total_amount -1) / 2, >> which when subtracted from total_amount will leave an odd result. If it >> doesn’t do this, then there is a serious problem with Gnucash >> arithmetic. > > That obviously depends on when the rounding occurs. > > The OP's example suggests it happens as late as possible, as one would > reasonably expect. If so, adding 0.005 to whichever of the two is > required to be rounded up is guaranteed to produce the desired effect. > > _______________________________________________ > gnucash-user mailing list > gnucash-user@gnucash.org > To update your subscription preferences or to unsubscribe: > https://lists.gnucash.org/mailman/listinfo/gnucash-user > If you are using Nabble or Gmane, please see > https://wiki.gnucash.org/wiki/Mailing_Lists for more information. > ----- > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user If you are using Nabble or Gmane, please see https://wiki.gnucash.org/wiki/Mailing_Lists for more information. ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All.
