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). I'm sure there are mathematicians on the list who can give you a more technical, precise explanation of the reasons for the different results. Cheers, Cliff -- http://mail.python.org/mailman/listinfo/python-list