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Bug #41363 superfriday
Submitted: 2007-05-11 09:18 UTC Modified: 2007-05-11 09:52 UTC
From: kongxs_9 at hotmail dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 5.2.2 OS: linux & windows
Private report: No CVE-ID: None
View Developer Edit
 [2007-05-11 09:18 UTC] kongxs_9 at hotmail dot com 
Description:
------------
wrong return value

Reproduce code:
---------------
<?
        $tmp = 2.01 * 100;
        echo gettype($tmp).":".$tmp.":".intval($tmp)."\n";
?>

Expected result:
----------------
double:201:200

Actual result:
--------------
double:201:201

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 [2007-05-11 09:52 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.

.
 
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