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Bug #15948 Basic Subtraction Error
Submitted: 2002-03-08 02:06 UTC Modified: 2002-03-08 02:36 UTC
From: abuckner at cicadadesign dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 4.0.6 OS: Red Hat Linux 7.1
Private report: No CVE-ID: None
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From: abuckner at cicadadesign dot com
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 [2002-03-08 02:06 UTC] abuckner at cicadadesign dot com 
This was submitted by one of our head developers.  We're using PHP/MySQL to build our customer relationship software, and this scares me.

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The numbers should add to 0. When I echo the result I get the below:

-5.6843418860808E-14.

<?

echo 241.20 + 169.23 - 410.43;

?>

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 [2002-03-08 02:36 UTC] derick@php.net 
This is actually not a bug, but a normal thing with floatingpoint numbers. If you want to do precise calculating, use cents, or decrease the precision in php.ini from 14 to something like 10.

Derick
 
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