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Bug #42581 strange echo of float vals
Submitted: 2007-09-06 15:59 UTC Modified: 2007-09-06 21:49 UTC
Votes:1
Avg. Score:1.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: ger dot kirill at gmail dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.4 OS: Windows, Linux
Private report: No CVE-ID: None
View Developer Edit
 [2007-09-06 15:59 UTC] ger dot kirill at gmail dot com 
Description:
------------
Just look into the code below. Note: could not be reproduced with *any* numbers. Use ones used in example to reproduce.

Reproduce code:
---------------
echo intval(144.2*100);//14419


Expected result:
----------------
14420

Actual result:
--------------
14419

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 [2007-09-06 21:49 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.

If you would like to know more about "floats" and what IEEE
754 is read this:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
 
Thank you for your interest in PHP.

.
 
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