Modulo Bug?

[David]

Am 11.08.2012 16:00, schrieb Peter Alexander:
> On Saturday, 11 August 2012 at 13:48:16 UTC, David wrote:
>> -1 % 16 = -1
>>
>> Shouldn't that be 15? It seems like the sign is ignored for the modulo.
>>
>> Is this a bug or intended behaviour? The Python implementation returns
>> here, as expected, 15.
>
>  From the language spec:
>
> "For integral operands of the / and % operators, the quotient rounds
> towards zero and the remainder has the same sign as the dividend."
>
> http://dlang.org/expression.html
>
> In your case, the dividend is -1, so the remainder has the same sign
> (-ve). The quotient rounds towards zero, so in this case the quotient is
> zero, so the remainder must be -1.
>
> Different programming languages handle it differently. In C and C++ it
> is implementation defined! (C++11 makes it the same as in D)
>
> See: http://en.wikipedia.org/wiki/Modulo_operation


Thanks! I thought modulo should alawys yield the same ... seems like I 
was wrong ;)