Modul (%) in python not like in C?

[Arnau Sanchez]

J. Cliff Dyer escribió:

> Dotan Cohen wrote:

>> FIrst of all, how is the % symbol (as in 70%6=4) called in English?
>>
>> Second, in Turbo C -111%10=-1 however in python -111%10=9. Is one or
>> the other in error? Is this a known gotcha? I tried to google the
>> subject however one cannot google the symbol %. Thanks in advance.
>>
>> Dotan Cohen
>>   
> 
> The % operator is called "modulo" in English.  I don't think the 
> difference in implementation is an error.  It's just a difference of 
> calculation method. 
> 
> Python will always yield a number x = m%n such that 0 <= x < n, but 
> Turbo C will always yield a number such that if x = m%n -x = -m%n.  That 
> is, since 111 % 10 = 1, -111 % 10 = -1.  The two values will always 
> differ by n (as used above). 

In fact, what you get in C depends on the compiler and architecture, while 
Python is always consistent and returns positive remainders.

More info:

http://www.python.org/doc/faq/programming/#why-does-22-10-return-3

http://groups.google.com/group/comp.lang.python/search?group=comp.lang.python&q=modulo+negative+C