From: Phrogz <gavin@...>
Date: 2007-03-20T07:10:14+09:00
Subject: Re: Exiting in the middle of the program

On Mar 19, 4:05 pm, Helgitomas Gislason <nitrohel...@hotmail.com>
wrote:
> There is a ruby calculator in the /ruby installation folder which has
> the ability of that when you just type 'Exit', the program exits.
>
> How can I add this feature to a program built by myself? So when I type
> 'Exit' in the middle of the program, the program exits ...

RTFM :)

C:\>ri Kernel#exit
------------------------------------------------------------
Kernel#exit
     exit(integer=0)
     Kernel::exit(integer=0)
     Process::exit(integer=0)
------------------------------------------------------------------------
     Initiates the termination of the Ruby script by raising the
     +SystemExit+ exception. This exception may be caught. The
optional
     parameter is used to return a status code to the invoking
     environment.

        begin
          exit
          puts "never get here"
        rescue SystemExit
          puts "rescued a SystemExit exception"
        end
        puts "after begin block"

     _produces:_

        rescued a SystemExit exception
        after begin block

     Just prior to termination, Ruby executes any +at_exit+ functions
     (see Kernel::at_exit) and runs any object finalizers (see
     ObjectSpace::define_finalizer).

        at_exit { puts "at_exit function" }
        ObjectSpace.define_finalizer("string",  proc { puts "in
finalizer" })
        exit

     _produces:_

        at_exit function
        in finalizer