The latest changes in the CoffeScript language have added a built-in "%%" operator:

> Correct modulo operator %% (respects negatives)

https://gist.github.com/aseemk/8637896

(In Python the % operator works in this correct way.)

It's the same operator I suggested to add to D.

Bye,
bearophile

On Tuesday, 28 January 2014 at 10:55:08 UTC, bearophile wrote:
> The latest changes in the CoffeScript language have added a built-in "%%" operator:
>
>> Correct modulo operator %% (respects negatives)
>
> https://gist.github.com/aseemk/8637896
>
> (In Python the % operator works in this correct way.)
>
> It's the same operator I suggested to add to D.
>
> Bye,
> bearophile

Wouldn't be better if the current implementation just extends to work with negatives instead of create a new one?

Asman01:

> Wouldn't be better if the current implementation just extends to work with negatives instead of create a new one?

The % operator present in D works with negative numbers in a definite way, as in C99. But it has a semantics that in most cases is not the most useful one.

You can't change the semantics of the % D operator because of code breakage and breakage of compatibility with C99. But %% is one of the few ways to offer a new semantics.

For unsigned values or signed values that D knows statically have a positive value %% gets replaced by %.

Bye,
bearophile