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Re: Floating point multiplication in python

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  Re: Floating point multiplication in python Chris Rebert <clp2@rebertia.com> - 2011-09-05 23:18 -0700

#12813 — Re: Floating point multiplication in python

On Mon, Sep 5, 2011 at 10:57 PM, xyz <xyzhtml@163.com> wrote:
> hi all:
>
> As we know ,  1.1 * 1.1 is 1.21 .
> But in python ,I got following :
>
>>>> 1.1 * 1.1
> 1.2100000000000002
>
> why python get wrong result?

It's not Python's fault per se, rather it's the inherent nature of
binary floating-point arithmetic. Try the equivalent in most other
languages and you'll get the same "error".
Please read http://docs.python.org/tutorial/floatingpoint.html

Cheers,
Chris

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