#41357 [Opn->Bgs]: substract integer part of a float value is not working well

From: Date: Thu, 10 May 2007 18:40:31 +0000
Subject: #41357 [Opn->Bgs]: substract integer part of a float value is not working well
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-112494@lists.php.net to get a copy of this message 
 ID:               41357
 Updated by:       johannes@php.net
 Reported By:      gonzalolarralde at gmail dot com
-Status:           Open
+Status:           Bogus
 Bug Type:         *Math Functions
 Operating System: Ubuntu Linux
 PHP Version:      5.2.2
 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:
------------------------------------------------------------------------

[2007-05-10 18:01:46] gonzalolarralde at gmail dot com

Description:
------------
When you try to get decimal part of a float number, if you substract
integer number to float one, it returns the decimal part plus
0.00000000000001.

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

var_dump(214.16569 - 214);

?>

Expected result:
----------------
0.16569

Actual result:
--------------
0.16569000000001


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


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