Modul (%) in python not like in C?
mattheww at chiark.greenend.org.uk
Tue Sep 11 19:00:52 CEST 2007
J. Cliff Dyer <jcd at sdf.lonestar.org> wrote:
>Bryan Olson wrote:
>> Not true. Here it is again:
>> When integers are divided, the result of the / operator is
>> the algebraic quotient with any fractional part discarded.(87)
>> If the quotient a/b is representable, the expression
>> (a/b)*b + a%b shall equal a.
>> 87) This is often called 'truncation toward zero'
>> [International Standard ISO/IEC 9899:1999, Section 6.5.5
>> Multiplicative operators, Paragraph 6 and footnote 87]
> But C was around for a long time before the 1999 standard. C89,
> commonly called ANSI C, is still very commonly used in compilers, and
> K&R C goes back to 1972. Is truncation toward 0 the standard for K&R C
> as well?
As I remember, the behaviour for negative 'a' wasn't specified in K&R C
or in C89; the rule was tightened up for C99.
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