From: John Maclean <info@...>
Date: 2006-01-06T01:14:47+09:00
Subject: Trapping errors, a simple example

Hey Chaps,

Here's a really simple menu with only 4 options. I'd like to be able do some simple error trapping... How's it done?

#!/usr/bin/ruby 
#Wed Jan  4 06:17:22 GMT 2006
class TopMenu
  def welcome
    puts "Welcome to de-blah-de-blah-de-blah"
    puts "~~~~~~~ ~~ ~~ ~~~~ ~~ ~~~~ ~~ ~~~~~"
  end

  def options
    # we will use this data to create a class called Option 
    # each option will have a new menu 
    # and will be a child class of the main one
    print "------------------------------------\nmenu - Which stage are you at?\n------------------------------------\n0:- Before site work\n1:- During site work\n2:- After site work\n3:- Other stuff\nq:- quit!\n"
  end

  # grab the input
  def topchoice
    print "enter your choice (0,1,2,q) : "
    p =  $stdin.gets # TODO:- check it's validity # TODO:- is the choice a number in the correct range?  # TODO:- does he wanna quit?  
    print "you have chosen #{p}"
    if p == "0"
      print "you have chosen #{p}"
    else
      if p == "q"
      print "you have chosen #{p}"
    end
  end
end




# create a new instance
top = TopMenu.new
top.welcome
top.options
top.topchoice


-- 
John Maclean
MSc (DIC)
07739 171 531