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Bug #30048 round() and number_format() calculates wrong
Submitted: 2004-09-10 10:48 UTC Modified: 2005-09-22 21:38 UTC
From: joerg dot klein at ifsam dot lu Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.0.0 OS: win2000
Private report: No CVE-ID: None
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From: joerg dot klein at ifsam dot lu
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 [2004-09-10 10:48 UTC] joerg dot klein at ifsam dot lu
Description:
------------
I use a fomular as the first paramter and the result is wrong. 
When brackets were set, the result is correct, but this makes no sense to me.

Reproduce code:
---------------
echo round(0.35*90/100);
echo number_format(0.35*90/100, 2, ".", "");

to get the correct result I should use the following syntax:
echo round(0.35* (90/100) )
echo number_format(0.35* (90/100) , 2, ".", "");

Expected result:
----------------
0.32
0.32

Actual result:
--------------
0.31
0.31

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 [2004-09-10 11:09 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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