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Bug #45094 wrong return of round()
Submitted: 2008-05-26 17:38 UTC Modified: 2008-05-26 20:02 UTC
From: webmaster at tsgames dot de Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.2.6 OS: Windows XP
Private report: No CVE-ID: None
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 [2008-05-26 17:38 UTC] webmaster at tsgames dot de 
Description:
------------
Function round() returns a wrong value ("-0") when the real value is lower than 0.

Reproduce code:
---------------
<?
echo "Value: ".round(-0.0001,0);
?>

Expected result:
----------------
Value: 0

Actual result:
--------------
Value: -0

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 [2008-05-26 20:02 UTC] jani@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.

If you would like to know more about "floats" and what IEEE
754 is, read this:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
 
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