How to simulate C style integer division?

[Jussi Piitulainen]

Steven D'Aprano writes:

> So my guess is that the fastest, and certainly the most obvious, way
> to get the same integer division behaviour as C99 would be:
>
> def intdiv(a, b):
>     # C99 style integer division with truncation towards zero.
>     n = a//b
>     if (a < 0) != (b < 0):
>         n += 1
>     return n

You should only increment if there is a (non-zero) remainder.