Float#round doesn't return nearest integers in some cases
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Key: JRUBY-5048
URL: http://jira.codehaus.org/browse/JRUBY-5048
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.5.2
Environment: Ubuntu 10.04
Reporter: Shugo Maeda
Priority: Minor
Attachments: float-round.diff
Float#round doesn't return nearest integers, for example in the following case:
{noformat}
$ ruby1.8 -v -e 'p 0.49999999999999994.round'
ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]
0
$ jruby1.5 -v -e 'p 0.49999999999999994.round'
jruby 1.5.2 (ruby 1.8.7 patchlevel 249) (2010-08-20 1c5e29d) (Java HotSpot(TM)
Client VM 1.6.0_20) [i386-java]
1
$
{noformat}
That is caused by the rounding error of 0.49999999999999994 + 0.5.
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