title: what does nil mean/represent here?
body: <p>Following are the simple statements in the <code>irb</code> shell. What does <code>nil</code>in the output mean ? Why does it accompany the print statement in the <code>if</code> block ? </p>
  
  <pre><code>irb(main):062:0&gt; if(x==20 &amp;&amp; y==30)
  irb(main):063:1&gt; print("if statement working !")
  irb(main):064:1&gt; else
  irb(main):065:1* print("else statement working !!")
  irb(main):066:1&gt; end
  if statement working !=&gt; nil # what does nil represent here ?
  </code></pre>