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Float number comparision problem #46347

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tsxy mannequin opened this issue Feb 12, 2008 · 3 comments
Closed

Float number comparision problem #46347

tsxy mannequin opened this issue Feb 12, 2008 · 3 comments
Labels
interpreter-core (Objects, Python, Grammar, and Parser dirs) stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@tsxy
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tsxy mannequin commented Feb 12, 2008

BPO 2075
Nosy @amauryfa

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = <Date 2008-02-12.08:11:23.217>
created_at = <Date 2008-02-12.05:36:02.968>
labels = ['interpreter-core', 'invalid', 'type-bug', 'library']
title = 'Float number comparision problem'
updated_at = <Date 2008-02-12.08:11:23.085>
user = 'https://bugs.python.org/tsxy'

bugs.python.org fields:

activity = <Date 2008-02-12.08:11:23.085>
actor = 'amaury.forgeotdarc'
assignee = 'none'
closed = True
closed_date = <Date 2008-02-12.08:11:23.217>
closer = 'amaury.forgeotdarc'
components = ['Interpreter Core', 'Library (Lib)']
creation = <Date 2008-02-12.05:36:02.968>
creator = 'tsxy'
dependencies = []
files = []
hgrepos = []
issue_num = 2075
keywords = []
message_count = 3.0
messages = ['62306', '62307', '62308']
nosy_count = 2.0
nosy_names = ['amaury.forgeotdarc', 'tsxy']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue2075'
versions = ['Python 2.5']
@tsxy
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Mannequin Author

tsxy mannequin commented Feb 12, 2008 

c=22.99*5.0
print c==114.95
"""This will produce false"""

c=22.99*4.0
print c==91.96
"""This will produce true"""

"""This is not expected behavior for python"""

@tsxy tsxy mannequin added interpreter-core (Objects, Python, Grammar, and Parser dirs) stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Feb 12, 2008
@tsxy
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tsxy mannequin commented Feb 12, 2008

The issue is reproduced under WIN32, version info as follows:
Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit
(Intel)] on win32

@amauryfa
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This is expected behavior. Please see
http://www.python.org/doc/faq/general/#why-are-floating-point-calculations-so-inaccurate

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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