DrJava / Bugs / #810 Comparison of NaNs

A lightweight programming environment for Java

#810 Comparison of NaNs

Milestone: 1: Would be nice if fixed ...

Status: closed-fixed

Owner: Mathias Ricken

Labels: Interactions (155)

Priority: 5

Updated: 2009-11-30

Created: 2009-10-25

Creator: Gerd Bohlender

Private: No

In interactions pane, NaNs are compared incorrectly.
Example:
double d = Double.NaN;
d == d
d == Double.NaN
both return true, which is incorrect.
According to IEEE 754, all comparisons with a NaN must return false.
In non-interactive mode, the result of e.g.
System.out.println (d==d);
is correct, i.e. false.

DrJava Version : drjava-20090821-r5004 on WIn XP, Java build 1.6.0_16-b01

Discussion

Mathias Ricken - 2009-10-27

status: open --> open-accepted
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Mathias Ricken - 2009-11-30

Same cause as bug 2881714:
Interactions panel "returns" false for 0.0 == -0.0
https://sourceforge.net/tracker/index.php?func=detail&aid=2881714&group_id=44253&atid=438935

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Mathias Ricken - 2009-11-30

Fixed as of revision 5138.

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Mathias Ricken - 2009-11-30

Fixed in SVN.

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Mathias Ricken - 2009-11-30

assigned_to: nobody --> mgricken

status: open-accepted --> closed-fixed
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Comparison of NaNs

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#810 Comparison of NaNs

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