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Not the op but:

On Tue, Aug 17, 2021 at 6:50 AM Flyer31 Test <> wrote:
> I would regard the "C" result of your example as wrong ... . What C
> compiler do you use there - or does this really any C do?

Then you are in for a lot of pain ;-> as it seems C99 mandates
rounding division towards zero ( previously it was imp-def-beh ).

( I agree with you in that in any place I've had to deal with modulos
using mixed signed ( between num/dem or in the range of any of them ),
rounding towards -inf has been better ( I normally did the rounding
myself in this cases, as I normally used C and wanted to avoid
implementation definednesses) ).

Francisco Olarte.