From: Lloyd Linklater <lloyd@2live4.com>
Date: 2008-09-15T22:18:51+09:00
Subject: Re: Need someone who can help

Dot Baiki wrote:
> Hello
> 
> Please, can someone help me with this problem. I am really stuck. Can't
> find my problem. Simple code snippet is not working at all. I totally
> desperate.
> 
> Look at this:
> --------------------start
> #!/usr/bin/env ruby
> 
> class AreaOfCircle
> 
> PI = 3.14159265
> 
>   def initialize(radius, area)
>     @radius = radius
>     @area = area
>   end
> 
>   def calc_area(radius)
>     @area = PI * @radius**2
>   end
> end
> 
> print 'Enter radius of circle: '
> keyboard_input = gets
> radius = keyboard_input.to_f
> 
> instance = AreaOfCircle.new
> screen_output = instance.calc_area(keyboard_input)
> puts screen_output
> ----------------------------------- end
> 
> I'm already pulling my hairs (not much left by now). Hopefully you can
> give me any hint!
> 
> Regards,
> Baiki

Well, I can see two things at a glance.

1.  You pass in the string rather than the radius which is to_f.
2.  The initialization requires TWO arguments.

Try something like this:

class AreaOfCircle

PI = 3.14159265

  def initialize(radius, area)
    @radius = radius
    @area = area
  end

  def calc_area(radius)
    @area = PI * @radius**2
  end
end


radius = 4.0

instance = AreaOfCircle.new(4, 3)
screen_output = instance.calc_area(radius)
puts screen_output
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