From: Markus Tarmak <m4rkusha@...>
Date: 2006-01-20T20:51:32+09:00
Subject: Re: Ruby Quiz #62

Adam Shelly wrote:
> On 1/19/06, James Edward Gray II <james@grayproductions.net> wrote:
>>
>> Na, that's not odd at all.  Just tell yourself .. is inclusive
>> and ... is exclusive (with regards to the last member).  See how that
>> extra dot pushes it off the end there...  ;)
>>
> That part I know.  But I expected (1...x) to be exactly equivalent to 
> (1..x-1)
> The difference bit me when I was trying to write a version of rand
> that took a range (It would be nice if that was a built-in...).  My
> first attempt is below, but it returns the wrong results when rng is
> an exclusive range.
> def rrand rng
>   rng.first + rand(rng.last-rng.first)
> end
> 
> -Adam

It's not equivalent because you forgot about floating point numbers.

irb(main):001:0> (1...9).include? 8.9
=> true

-- 
Posted via http://www.ruby-forum.com/.