php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #50975 Floating point match Failure
Submitted: 2010-02-09 16:43 UTC Modified: 2010-02-09 16:44 UTC
From: dmgx dot michael at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.3.1 OS: Windows & Linux
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: dmgx dot michael at gmail dot com
New email:
PHP Version: OS:

 

 [2010-02-09 16:43 UTC] dmgx dot michael at gmail dot com 
Description:
------------
What is 34.2 - 33.98? I don't think the answer needs 15 digits.

Reproduce code:
---------------
<?php echo 34.2 - 33.98 ?>

Expected result:
----------------
0.22

Actual result:
--------------
0.22000000000001

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2010-02-09 16:44 UTC] rasmus@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
 
Thank you for your interest in PHP.

.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Dec 27 17:01:30 2024 UTC