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Bug #31625 <?php var_dump(123343423.56-123343483.54);?> return float(-59.9800000042) ! WHY
Submitted: 2005-01-20 17:15 UTC Modified: 2005-01-20 18:00 UTC
From: zyme at cpcw dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.0.2 OS: windows 2003 + apache 2
Private report: No CVE-ID: None
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 [2005-01-20 17:15 UTC] zyme at cpcw dot com 
Description:
------------
<?php var_dump(123343423.56-123343483.54);?>
return float(-59.9800000042) !
WHY ?

Reproduce code:
---------------
<?php var_dump(123343423.56-123343483.54);?>

Expected result:
----------------
float(-59.9800000042)

Actual result:
--------------
float(-59.98)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2005-01-20 18:00 UTC] magnus@php.net 
Floating point values have a limited precision. Hence a value might 
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly 
printing it without any mathematical operations.
 
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