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

go to bug id or search bugs for

Bug #26874 round floting number have bad result
Submitted: 2004-01-12 01:48 UTC Modified: 2005-09-22 21:39 UTC
From: yehlu at ms1 dot hinet dot net Assigned:
Status: Not a bug Package: Math related
PHP Version: 4.3.4 OS: 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: yehlu at ms1 dot hinet dot net
New email:
PHP Version: OS:

 

 [2004-01-12 01:48 UTC] yehlu at ms1 dot hinet dot net 
Description:
------------
<?php
    $a = 3100;
    echo "\$a :".$a."\n";
    $a *= 1.025;
    echo "\$a * 1.025 :".$a."\n";
    echo "round \$a:".round($a)."\n";  //get 3177
    echo "round \$a:".round("$a")."\n"; //get 3178
    $b = "3177.5";
    echo "\$b:".$b."\n";
    echo "round \$b:".round($b)."\n"; //get 3178
?>

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2004-01-12 06:17 UTC] eru@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.
 
Thank you for your interest in PHP.

.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri Oct 18 03:01:27 2024 UTC