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Bug #26954 0.1 - 01 = -2.77555756156E-017
Submitted: 2004-01-18 09:54 UTC Modified: 2004-01-18 10:00 UTC
From: choikh at oms dot cc Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 4.3.4 OS: window, linux
Private report: No CVE-ID: None
View Developer Edit
 [2004-01-18 09:54 UTC] choikh at oms dot cc 
Description:
------------
bug sample

<?
$tot = 0.3;
for($i=0;$i < 3; $i++)
{
    echo("==> $tot, ");
    $tot -= 0.1;
    echo("==> $tot<br>");

}
?>

result 
==> 0.3, ==> 0.2
==> 0.2, ==> 0.1
==> 0.1, ==> -2.77555756156E-017

why ?

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 [2004-01-18 10:00 UTC] derick@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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