Serious error in int() function?

[Alain Ketterlin]

martin.spichty at gmail.com writes:

> print int(float(2.8/0.1))
>
> yields
>
> 27
>
> instead of 28!!

That's how floating-point arithmetic works: look at the result of
2.8/0.1 to see why int() is correct.

> Is that known?

Yes, it is known, and correct since you use "float". See
http://floating-point-gui.de/ for a nice explanation. Use decimal
(https://docs.python.org/2/library/decimal.html) if you need exact
representations.

-- Alain.