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Bug #9843 Decrement Operator
Submitted: 2001-03-19 14:46 UTC Modified: 2001-03-19 14:56 UTC
From: jplock at bigfoot dot com Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 4.0.4pl1 OS: Linux
Private report: No CVE-ID: None
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From: jplock at bigfoot dot com
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 [2001-03-19 14:46 UTC] jplock at bigfoot dot com 
I believe there is a problem with the decrement operator.

http://www.artemisgroup.com/test.php

$percentchange = .30;
while ($percentchange > -1){
  $percentchange -= .01;
  echo $percentchange;
}

zero is returned as -1.422473250301E-16 and 0.01 is returned as 0.0099999999999999. This seems incorrect to me.

Thanks

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 [2001-03-19 14:56 UTC] hholzgra@php.net 
theese are typical rounding errors that
occure when dealing with decimal fractions
on binary based machines
 
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