From: Tim Ferrell <Tim.Ferrell@...0nspark.com>
Date: 2005-02-12T05:14:39+09:00
Subject: Re: a problem outputting text

try this...

#---- test.rb ----

class Song
   attr_writer :name, :duration

   def initialize(name, duration)
     @name = name
     @duration = duration
   end

   def print
     puts "The song name is #{@name} and the duration is {@duration}\n\n"
   end
end

class Song2
   attr_writer :name, :duration

   def initialize(name, duration)
     @name = name
     @duration = duration
   end

   def to_s
     return "The song name is #{@name} and the duration is duration}\n\n"
   end
end

if $0 == __FILE__

   # create an instance of Song
   asong = Song.new("Some Bangin' Tune", 2443)
   puts asong
   asong.print

   # change attribute values
   asong.name = "A New Tune"
   asong.duration = 3750
   puts asong
   asong.print

   # create an instance of Song2
   asong = Song2.new("Another Bangin' Tune", 2660)
   puts asong

end

#---- end test.rb ----

a few things to note... in your original version you had:

puts { "text here" }

Ruby sees the braces as a block associated with the call to puts, rather 
than an argument to puts, which is why it was printing blank lines

I also think attr_writer implies attr_reader so you don't need both when 
using attr_writer.

Also, by adding a method to_s to a class (as in Song2), it is 
automatically called when you "puts" the varas opposed to just printing 
out the address

Hope this helps...

Cheers,
Tim


Ghelani, Vidhi wrote:
> Hey, 
> 
>  
> 
> I am trying to test some of my code. Here it is :
> 
> ************************************************************************
> *************************
> 
> class Song
> 
>  
> 
>      def duration= (newDuration)
> 
>          @duration = newDuration
> 
>      end
> 
>  
> 
>      def initialize(name, duration)
> 
>          @name = name
> 
>          @duration = duration
> 
>      end
> 
>  
> 
>      attr_reader :name, :duration
> 
>      attr_writer :name, :duration
> 
>  
> 
>     def print
> 
>       puts {"The song title is  #{@name} and the track length is
> #{@duration} /n" }
> 
>     end
> 
>  
> 
>  
> 
>   end
> 
>  
> 
>   
> 
>     asong = Song.new("Mahi Ve", 2443)
> 
>     asong.print
> 
>     asong.name
> 
>     asong.duration
> 
>  
> 
> ************************************************************************
> ***********************
> 
> However, this does not print anything. There are no errors showing up
> either. All that happens is that it prints blank lines.
> 
>  
> 
> Does anyone know where I am going wrong ?
> 
>  
> 
> Any help would be appreciated.
> 
>  
> 
> Thanks, 
> 
> Vidhi 
> 
>     
> 
>