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Bug #55721 sprintf error
Submitted: 2011-09-18 19:21 UTC Modified: 2011-09-18 23:21 UTC
From: umka at localka dot net Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: Irrelevant OS: FreeBSD 7.2, 8.2
Private report: No CVE-ID: None
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 [2011-09-18 19:21 UTC] umka at localka dot net 
Description:
------------
$a=11111111111111111111111111111111111.00";
$b=sprintf("%036.2f",$a);  // eq 11111111111111109993981897808543744.00



Test script:
---------------
$a=11111111111111111111111111111111111.00";
$b=sprintf("%036.2f",$a);  // eq 11111111111111109993981897808543744.00

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 [2011-09-18 23:21 UTC] cataphract@php.net
-Status: Open +Status: Bogus
 [2011-09-18 23:21 UTC] cataphract@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.

If you would like to know more about "floats" and what IEEE
754 is, read this:
http://www.floating-point-gui.de/

Thank you for your interest in PHP.
 
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