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https://issues.apache.org/jira/browse/GROOVY-7652?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Wagenleitner updated GROOVY-7652:
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Description:
The {{trunc}} methods on Float/Double use the {{Math.floor}} method for all
values, however for negative values this causing rounding. I think for
negative values {{Math.ceil}} needs to be used.
Here are some asserts to show the rounding:
{code}
Float f = -123.739f
Double d = -123.739d
assert -123f == f.trunc() // fails: -124
assert -123d == d.trunc() // fails: -124
assert -123.73f == f.trunc(2) // fails: -123.74
assert -123.73d == d.trunc(2) // fails:
-123.73
{code}
was:
The {{trunc}} methods on Float/Double use the {{Math.floor}} method for all
values, however for negative values this causing rounding down. I think for
negative values {{Math.ceil}} needs to be used.
Here are some asserts to show the rounding:
{code}
Float f = -123.739f
Double d = -123.739d
assert -123f == f.trunc() // fails: -124
assert -123d == d.trunc() // fails: -124
assert -123.73f == f.trunc(2) // fails: -123.74
assert -123.73d == d.trunc(2) // fails:
-123.73
{code}
Summary: Float/Double trunc methods perform rounding for negative
values (was: Float/Double trunc methods round down for negative values)
> Float/Double trunc methods perform rounding for negative values
> ---------------------------------------------------------------
>
> Key: GROOVY-7652
> URL: https://issues.apache.org/jira/browse/GROOVY-7652
> Project: Groovy
> Issue Type: Bug
> Components: groovy-jdk
> Affects Versions: 2.4.5
> Reporter: John Wagenleitner
> Priority: Minor
>
> The {{trunc}} methods on Float/Double use the {{Math.floor}} method for all
> values, however for negative values this causing rounding. I think for
> negative values {{Math.ceil}} needs to be used.
> Here are some asserts to show the rounding:
> {code}
> Float f = -123.739f
> Double d = -123.739d
> assert -123f == f.trunc() // fails: -124
> assert -123d == d.trunc() // fails: -124
> assert -123.73f == f.trunc(2) // fails: -123.74
> assert -123.73d == d.trunc(2) // fails:
> -123.73
> {code}
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