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Bug #46566 wrong calculating
Submitted: 2008-11-13 13:36 UTC Modified: 2008-11-13 13:39 UTC
From: krumb at valentins dot de Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.6 OS: Suse Linux
Private report: No CVE-ID: None
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From: krumb at valentins dot de
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 [2008-11-13 13:36 UTC] krumb at valentins dot de
Some strange calculating mistake
It seems to happen in the second line at 7/100*100, echos zero, had to be zero but internal it seems thats not zero

Reproduce code:

echo $brutto."-".$discount."=";
echo $new;


Expected result:

Actual result:


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 [2008-11-13 13:39 UTC]
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:
Thank you for your interest in PHP.

 [2011-07-18 16:07 UTC] beno9119 at gmail dot com

echo $brutto."-".$discount."=";
echo round($new,2);

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