#!/usr/bin/env ruby
# This code comes from http://ruby-it.org/pages/IRB
# Check the page for copyright notice and explanations



irb(main):001:0> a= 1+2
=> 3
irb(main):002:0> a
=> 3
irb(main):003:0> a+3
=> 6
irb(main):004:0> a
=> 3
irb(main):005:0> a+=3
=> 6
irb(main):006:0> a+ b
NameError: undefined local variable or method `b' for main:Object
        from (irb):6

>> def che_ne_penso_di_irb
>>  "molto meglio"
>> end
=> nil
>> che_ne_penso_di_irb
=> "molto meglio"

>> x=10
=> 10
>> irb
>> x
NameError: undefined local variable or method `x' for main:Object
        from (irb#1):1
>> exit
=> #<IRB::Irb: @context=#<IRB::Context:0x29de070>, @signal_status=:IN_EVAL, @sca
nner=#<RubyLex:0x29dcd98>>
>> x
=> 10

>> obj=Object.new
=> #<Object:0x29faeb8>
>> pushws obj
=> [main]
>>  def dieci
>>   10
>>  end
=> nil
>> popws
=> []
>> obj.dieci
=> 10