[issue25378] Roundoff error on OS X

[Michał Jan Warecki]

New submission from Michał Jan Warecki:

This should speak for itself:

>>> 3*4.35
13.049
>>> 

The error is reproducible, and applies to all decimal numbers ending with 
\.[0-9]5, and \.[0-4] as well as \.[6-9], when multiplied by 3. Examples:

>>> 3*4.1
12.299
>>> 3*4.4
13.201
>>> 3*4.6
13.799
>>> 3*4.8
14.399
>>> 3*4.9
14.701
>>> 4*3.1
12.4
>>> 4*4.1
16.4
>>> 3*4.1
12.299
>>> 6*4.1
24.598
>>> 6*4.4
26.402
>>>

--
components: Macintosh
messages: 252828
nosy: Michał Jan Warecki, ned.deily, ronaldoussoren
priority: normal
severity: normal
status: open
title: Roundoff error on OS X
type: behavior
versions: Python 2.7, Python 3.4

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[issue25378] Roundoff error on OS X

[Michał Jan Warecki]

Changes by Michał Jan Warecki :


--
components: +Interpreter Core

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[issue25378] Roundoff error on OS X

[Ezio Melotti]

Ezio Melotti added the comment:

See https://docs.python.org/3/tutorial/floatingpoint.html

--
nosy: +ezio.melotti
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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