Re: [PHP-DEV] Re: #22527 [Opn->Bgs]: Modulus returned negative value

On Tuesday, March 4, 2003, at 10:33  AM, Sascha Schumann wrote:

> On Tue, 4 Mar 2003, George Schlossnagle wrote:
>
>> Interesting.
>>
>> I don't know what the ISO standard say, but mathematically a a % b 
>> will
>> always return you an integer 0 <= a%b < b (since there are no negative
>> numbers in canonical representation of Z/bZ).  I guess perl/python/tcl
>> ddecided to adhere to the mathematical definition.
>
>     ISO C truncates towards zero.  It specifically says in 6.5.5
>     Multiplicative Operators:
>
>     If the quotient a/b is representable, the expression (a/b)*b
>     + a%b shall equal a.
>
>     So -27 % 7 yields -6.

Yeah, I read that in the bug report and confirmed that as the intended 
behavior in C.  What I meant was 'regardless of what the ISO standard 
says, thats not a standard mathematical definition.'