title: Converting an Integer Array into a Number
body: <p>Think I have an integer array like this: </p>
  
  <pre><code>a[0]=60; a[1]=321; a[2]=5;
  </code></pre>
  
  <p>now I want to convert the whole of this array into an integer number, for example <code>int b</code> become 603215 after running the code. </p>
  
  <p>How to do it?</p>