#46407 [Opn->Bgs]: Wrong equality determination.

From: Date: Tue, 28 Oct 2008 21:22:49 +0000
Subject: #46407 [Opn->Bgs]: Wrong equality determination.
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-130238@lists.php.net to get a copy of this message 
 ID:               46407
 Updated by:       jani@php.net
 Reported By:      lambry_danchev at hotmail dot com
-Status:           Open
+Status:           Bogus
 Bug Type:         Math related
 Operating System: Linux SlackWare 12.1
 PHP Version:      5.2.6
 New Comment:

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
 
Thank you for your interest in PHP.




Previous Comments:
------------------------------------------------------------------------

[2008-10-28 14:24:50] lambry_danchev at hotmail dot com

Description:
------------
Simple EQUATION was calculated incorrectly when some "magic" numbers
was involved in.

Reproduce code:
---------------
<?php

if ( (0+12.44) == (7.44+5) )  {echo "TRUE";} else {echo "FALSE";}

?>


Expected result:
----------------
TRUE

Actual result:
--------------
FALSE


------------------------------------------------------------------------


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