title: format number in pascal by counting from 001
body: <p>I am developing an app that assign registration number automatically to students.</p>
  
  <p>How can I format "1" as "001" I.e to start counting from 001 not 1
  For example:</p>
  
  <pre><code>Ubah david: 14/CSC/001
  .....
  Obi emeka : 14/CSC/122
  </code></pre>