title: Addition in velocity template engine
body: <p>I have to increment a number in velocity template engine.</p>
  
  <pre><code>#set ($newIndex = $oldIndex+ 1)
   $newIndex
  </code></pre>
  
  <p>but i am getting incorrect result e.g if value of $oldIndex is 1 then i am getting 11 instead of 2</p>