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Bug #45321 Subtract two float no
Submitted: 2008-06-20 10:19 UTC Modified: 2008-06-20 11:49 UTC
From: saurabh-goyal at hotmail dot com Assigned:
Status: Not a bug Package: Output Control
PHP Version: 5.2.6 OS: Windows NT
Private report: No CVE-ID: None
View Developer Edit
 [2008-06-20 10:19 UTC] saurabh-goyal at hotmail dot com 
Description:
------------
<?php
echo 4998937.3273-4998918.4921;
?>
Output :-18.8351999996

But Exactly Output is 18.8352   

Reproduce code:
---------------
<?php
echo 4998937.3273-4998918.4921;
?>




Expected result:
----------------
Output :-18.8351999996

Actual result:
--------------
But Exactly Output is 18.8352

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 [2008-06-20 11:49 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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