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

go to bug id or search bugs for

Bug #45321 Subtract two float no
Submitted: 2008-06-20 10:19 UTC Modified: 2008-06-20 11:49 UTC
From: saurabh-goyal at hotmail dot com Assigned:
Status: Not a bug Package: Output Control
PHP Version: 5.2.6 OS: Windows NT
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: saurabh-goyal at hotmail dot com
New email:
PHP Version: OS:

 

 [2008-06-20 10:19 UTC] saurabh-goyal at hotmail dot com 
Description:
------------
<?php
echo 4998937.3273-4998918.4921;
?>
Output :-18.8351999996

But Exactly Output is 18.8352   

Reproduce code:
---------------
<?php
echo 4998937.3273-4998918.4921;
?>




Expected result:
----------------
Output :-18.8351999996

Actual result:
--------------
But Exactly Output is 18.8352

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2008-06-20 11:49 UTC] johannes@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 © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Wed Feb 05 08:01:30 2025 UTC