From: Axel Etzold <AEtzold@...>
Date: 2008-06-10T06:13:33+09:00
Subject: Re: C++ 2 Ruby


-------- Original-Nachricht --------
> Datum: Tue, 10 Jun 2008 05:38:30 +0900
> Von: Jed Kowalski <satanowicz@gmail.com>
> An: ruby-talk@ruby-lang.org
> Betreff: Re: C++ 2 Ruby

> Avdi Grimm wrote:
> > You might have better luck asking for help with specific sections of
> > code, rather than asking us to rewrite a whole program.  Try doing a
> > best-guest translation to Ruby on your own, and asking about the parts
> > you have trouble with.
> 
> ok so, here's the first problem:
>    def initialize (cen, ile, nn)
>        @price=cen
>        @amount=ile
>        @name=nn
>        @bought=0
>      end
> 
> 
>     def change(x)
>           amount--
>           bought++
>           return x-price //WHATS WRONG HERE?
>     end
> 
> and I get:
> 
> gut.rb:13: void value expression
>           return x-cena
>                   ^
> gut.rb:13: syntax error, unexpected tIDENTIFIER, expecting kEND
>           return x-cena
> 
> -- 
> Posted via http://www.ruby-forum.com/.

Jed, you could do this:

class MyClass  # my most creative invention of a class name
  attr_accessor :price,:amount,:name,:bought  # creates ways to get/set @price,@amount,... from MyClass
 
 def initialize (cen, ile, nn)
       @price=cen
       @amount=ile
       @name=nn
       @bought=0
     end
    def change(x)
          @amount-=1
          @bought+=1
          x-self.price
    end
  end
  
  cen=500
  ile=400
  nn=4
  obj=MyClass.new(cen,ile,nn)
  p obj.change(1)  # -499 =1-500
  
Read about accessors here:  http://www.ruby-doc.org/docs/UsersGuide/rg/accessors.html

Best regards,

Axel 
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