[D1] modulo on neg integer
qw at er.ty
Thu Mar 18 05:44:35 PDT 2010
> > If memory serves me right, module is undefined on negative integers.
> I think it's defined in D (but it's defined badly).
Got url ? :)
> > int i = -2;
> > i%=10; // i=undefined?
> > What should I use instead to get i definitely equal to 7?
> D outputs -2, Python outputs 8. It's not easy to find a language that outputs 7 there, maybe Malborge language?
8 yeah :(somehow I did overcompensated for the max being 9 for %10)
i = -3 -2 -1 0 1 2
i%3 = 7 8 9 0 1 2
So I should be safe with
i % M;
if(i<0) i = M + i;
> > On a sidenote, where can I read about operation order/definitions?
> > Like i++, ++i and i%10 not changing i etc.
> D acts like C, here. Even when C does something badly. So you can surely find info about ++ and % in C.
I'd wish it was available here, as I don't really know C(++).
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