4 hundred quadrillonth?

MRAB google at mrabarnett.plus.com
Fri May 22 02:01:02 CEST 2009


Grant Edwards wrote:
> On 2009-05-21, Christian Heimes <lists at cheimes.de> wrote:
>> seanm.py at gmail.com schrieb:
>>> The explaination in my introductory Python book is not very
>>> satisfying, and I am hoping someone can explain the following to me:
>>>
>>>>>> 4 / 5.0
>>> 0.80000000000000004
>>>
>>> 4 / 5.0 is 0.8. No more, no less. So what's up with that 4 at the end.
>>> It bothers me.
>> Welcome to IEEE 754 floating point land! :)
> 
> Floating point is sort of like quantum physics: the closer you
> look, the messier it gets.
> 
I have the same feeling towards databases.



More information about the Python-list mailing list