From: Steve Wilhelm <steve@...831.com>
Date: 2009-11-29T16:27:52+09:00
Subject: Re: Just found a round problem

Florian Gilcher wrote:

> On Nov 29, 2009, at 12:06 AM, Ruby Newbee wrote:
> 
>> irb(main):026:0> 10.499999999999999.round
>> => 10
>> irb(main):027:0> 10.4999999999999999.round
>> => 11
>>
>>
>> Does this happen due to the float problem in any languages including  
>> ruby?
>> Thanks.
> 
> 
> Thats IEEE 754 float behaviour, yes. python behaves exactly the same.
> 
> - --
> Florian Gilcher
> 

And PHP 5 as well.

php -r 'echo sprintf ("PHP Version = %s\nround(10.499999999999999) = 
%d\nround(10.4999999999999999) = %d\n", phpversion(), 
round(10.499999999999999), round(10.4999999999999999));'

PHP Version = 5.2.6
round(10.499999999999999) = 10
round(10.4999999999999999) = 11

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