From: Bertram Scharpf <lists@...>
Date: 2009-10-14T17:36:13+09:00
Subject: Re: How to execute a break in a loop via user input

Hi,

Am Mittwoch, 14. Okt 2009, 11:55:50 +0900 schrieb Rajinder Yadav:
> Thomas Wilson wrote:
>> I have a loop running that needs to be broken when the user hits a
>> specified key.
>
> There is no best way, here are 2 ways to mull over, first way gives you an 
> idea of how to break out of a loop. The 2ns way show use of a do/while 
> loop, that test for the loop condition is done at the end, not the start.

Be aware that pressing Ctrl-D (Unix) makes gets return nil, not a
string.

> while(true)
>    c = gets
>    break if c.chomp == 'x'
> end

  loop do
     c = gets
     break if not c or c.chomp == 'x'
  end

> begin
>    c = gets.chomp
> end while c != 'x

  begin
     c = gets.to_s.chomp
  end while c != 'x

Bertram


-- 
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de