[New-bugs-announce] [issue28285] 35.5 - 29.58 = 5.920000000000002 (it's false !)

[Hogren]

New submission from Hogren:

I was using python as calculator when I enter :
35.5 - 29.58

I am surprising when python give me a result with many decimals:
5.920000000000002

I tried to change one number :
35.5 - 29.57
The result is correct : 5.93

The error is present again when I tried to inverse numbers (29.57-35.5).

The error is again present when I tried to use 35.50 in place of 35.5.



I tested on python 2.7 and 3.4, compiled with gcc 4.9.3, on Gentoo.


Thanks for all who contribute to this good project which is Python !

Hogren

----------
messages: 277511
nosy: Hogren
priority: normal
severity: normal
status: open
title: 35.5 - 29.58 = 5.920000000000002 (it's false !)
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28285>
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