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Bug #30614 Adding floating numbers fails
Submitted: 2004-10-29 19:21 UTC Modified: 2004-10-29 20:17 UTC
From: mauricio at elmaster dot com Assigned:
Status: Not a bug Package: Reproducible crash
PHP Version: 5.0.1 OS: Linux
Private report: No CVE-ID: None
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From: mauricio at elmaster dot com
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 [2004-10-29 19:21 UTC] mauricio at elmaster dot com 
Description:
------------
This simple operation fails. We have tried it on PHP 4.3.4 standard install on fedora Core 2, and PHP 5.0.1.

Instead of 0 we get 1-8.8817841970013E-16. If we change a bit the number the code doesn't fails, very weird.

Reproduce code:
---------------
<?php
  die(9.95 + 4.97 - 9.95 - 4.97);
                                                                                                                             ?>

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

Actual result:
--------------
1-8.8817841970013E-16

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 [2004-10-29 20:17 UTC] magnus@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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