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Bug #27685 floating point?
Submitted: 2004-03-24 19:12 UTC Modified: 2004-03-24 19:22 UTC
From: ymlee at ibcenter dot co dot kr Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 4.3.4 OS: linux
Private report: No CVE-ID: None
View Developer Edit
 [2004-03-24 19:12 UTC] ymlee at ibcenter dot co dot kr 
Description:
------------
$a=33.6;
$b=84.7;
$c=118.3;

$d=$a+$b-$c;

echo $d;

the answer should 0.
but result is 1.4210854715202E-14.

it is strange!!!

Reproduce code:
---------------
$a=33.6;
$b=84.7;
$c=118.3;

$d=$a+$b-$c;

echo $d;


Expected result:
----------------
0

Actual result:
--------------
1.4210854715202E-14

Patches

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AllCommentsChangesGit/SVN commitsRelated reports
 [2004-03-24 19:22 UTC] abies@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.

.
 
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