Re: 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.'