title: what happens when we invoke a method on a nil pointer
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/156395/sending-a-message-to-nil">Sending a message to nil?</a>  </p>
  </blockquote>
  
  
  
  <p>what happens when we invoke a method on a nil pointer</p>