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Bug #63424 Incorrect ceil() rounding
Submitted: 2012-11-03 08:39 UTC Modified: 2012-11-03 08:46 UTC
From: pgt-r at ya dot ru Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.4.7RC1 OS: Windows XP SP3
Private report: No CVE-ID: None
View Developer Edit
 [2012-11-03 08:39 UTC] pgt-r at ya dot ru 
Description:
------------
Problem in function ceil()

Test script:
---------------
<?php
    echo ceil((10 + 100) / 100 * 100); //111, but not 100
?>

Expected result:
----------------
The function ceil(((10 + 100) / 100 * 100)) must be return 110, but return 111

Actual result:
--------------
fffff

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 [2012-11-03 08:46 UTC] nikic@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://www.floating-point-gui.de/

Thank you for your interest in PHP.
 [2012-11-03 08:46 UTC] nikic@php.net
-Status: Open +Status: Not a bug
 [2012-11-03 08:46 UTC] nikic@php.net
-Summary: c +Summary: Incorrect ceil() rounding
 
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