title: node.js displays "undefined" on the console
body: <p>Recently I installed node.js on my Windows 7 machine. </p>
  
  <p>On execution of JavaScript, I get an <em>undefined</em> message along with successful execution of the expression. </p>
  
  <p>What's wrong here? I have not noticed any other side effects.</p>
  
  <p><img src="https://i.stack.imgur.com/Egdfu.png" alt="enter image description here"></p>