Bug #54017 [Opn->Bgs]: allocation error of float variable
| From: | pajoye@php.net | Date: | Mon, 14 Feb 2011 16:54:17 +0000 |
| Subject: | Bug #54017 [Opn->Bgs]: allocation error of float variable | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-158771@lists.php.net to get a copy of this message | ||
Edit report at http://bugs.php.net/bug.php?id=54017&edit=1
ID: 54017
Updated by: pajoye@php.net
Reported by: davidmdvd at gmail dot com
Summary: allocation error of float variable
-Status: Open
+Status: Bogus
Type: Bug
Package: *General Issues
Operating System: Windows 7 64(bits)
PHP Version: 5.3.5
Block user comment: N
Private report: N
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://www.floating-point-gui.de/
Thank you for your interest in PHP.
Previous Comments:
------------------------------------------------------------------------
[2011-02-14 17:48:11] davidmdvd at gmail dot com
Description:
------------
<?php
$ar = array();
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.425;
$ar[] = 0.425;
$ar[] = 0.425;
if ( array_sum($ar)>=17 )
"It was to come."
?>
Test script:
---------------
<?php
$ar = array();
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.85;
$ar[] = 0.425;
$ar[] = 0.425;
$ar[] = 0.425;
if ( array_sum($ar)>=17 )
"It was to come."
?>
Expected result:
----------------
It was to come.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=54017&edit=1