From: Robert Oliver <rob@...>
Date: 2006-10-26T08:25:21+09:00
Subject: Re: simple math question

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On 10/25/06, Brad Tilley <rtilley@vt.edu> wrote:
>
> What's the quickest way to determine if an int is an even number
> 2,4,6,8...
> Anything such as int.even or int.odd returning true/false? I want to
> test the length of an array and add one element to it if it has an odd
> number of elements.
>

You can determine if a number is odd by doing this:

class Fixnum
  def odd?
    if self % 2 == 0
      return nil
    else
      return true
    end
  end
  def even?
    if self % 2 == 0
      return true
    else
      return nil
    end
  end
end

Then just call it like this:

2.odd?
and you'll get nil
3.odd?
and you'll get true

The above is messy, I'm sure it can be cleaned up, but you get the idea.

-- 
Robert W. Oliver II
President, OCS Solutions, Inc. - Web Hosting and Development
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