[D1] modulo on neg integer

bearophile bearophileHUGS at lycos.com
Thu Mar 18 05:19:02 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).

> 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?

> 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.


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