From: Bertram Scharpf <lists@...>
Date: 2009-12-21T03:56:51+09:00
Subject: Re: simple one

Hi,

Am Sonntag, 20. Dez 2009, 03:20:33 +0900 schrieb beny 18241:
> i used both methods and they works (thanks for that), but i have ine 
> more question (both methods are affected)
> 
> ---
> #!/usr/bin/ruby
> 
>     def ask(prompt)
>         loop do
>             print prompt, ' '
>             $stdout.flush
>             s = gets
>             exit if s == nil
>             s.chomp!
>             if s == 'y' or s == 'yes'
>                 return true
>             elsif s == 'n' or s == 'no'
>                 return false
>             else
>                 $stderr.puts "Please answer yes or no."
>             end
>         end
>     end
> 
> ask(' => ')
> ---
> 
> i Saved it as a file.rb, as there is a small part of my bigger scirpt , 
> i wanted to add argument, so i'am running it with argument(which is used 
> later in my script):
> 
> ./file.rb file.xml
> 
> and i recive
>  =>  Please answer yes or no.
>  =>  Please answer yes or no.
>  =>  Please answer yes or no.
> ...
> 
> I know that I should clear input or something like that, but i dont know 
> how , I' ve tried many ways.

There must be a loop around the `ask' method.

By the way, why don't you use `case'?

  def ask prompt
    loop do
      print prompt, ' '
      $stdout.flush
      s = gets or break
      s.chomp!
      case s
        when /^y/i, "ja", "oui" then break true
        when /^n/i              then break false
        else                         $stderr.puts "Please answer yes or no."
      end
    end
  end

  ask ' =>'

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
*
Discover String#notempty? at <http://raa.ruby-lang.org/project/step>.