ruby_errors.rb

class Table
  attr_reader :num_legs

  def initialize(num_legs)
    if num_legs > 0
      @num_legs = num_legs
    elsif num_legs == 0
      raise "Tables have one or more legs."
    else
      raise ArgumentError, "The number of legs has to be greater than zero."
    end
  end
end

def create_table(legs)
  begin
    t = Table.new legs
    p t
  rescue ArgumentError => e
    puts "You: #{e.message}"
    puts "Me:  So sorry!"
  rescue => e
    puts "Say what?"
    puts e.backtrace
  end
  puts "All done!"
end

create_table(0)