title: How to concatenate elements of an array into an integer
body: <p>There is an array say arr with elements</p>
  
  <pre><code>6,5,1,0,9
  </code></pre>
  
  <p>I want an integer</p>
  
  <pre><code>a=65109
  </code></pre>
  
  <p>and</p>
  
  <pre><code>b=90156
  </code></pre>