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Bug #30191 sum error
Submitted: 2004-09-22 06:24 UTC Modified: 2004-09-22 08:09 UTC
From: roberto at spadim dot com dot br Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.0.1 OS: linux, windows xp
Private report: No CVE-ID: None
View Developer Edit
 [2004-09-22 06:24 UTC] roberto at spadim dot com dot br 
Description:
------------
sum error: 
590-589.99!=0.01 
	 

Reproduce code:
---------------
<?php
	echo 590-589.99;
	echo "\n";
	echo (double)(590)-(double)(589.99);	
?>

Expected result:
----------------
0.01 
0.01 

Actual result:
--------------
0.0099999999999909 
0.0099999999999909

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 [2004-09-22 08:09 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.
 
Thank you for your interest in PHP.

http://www.php.net/manual/en/language.types.float.php
 
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