title: Round number up to nearest quarter
body: <p>I want to round <code>n</code> up to the nearest quarter, so</p>
  
  <ul>
  <li>3.00 &lt; n &lt; 3.25 : rounds to 3.25</li>
  <li>3.25 &lt; n &lt; 3.50 : rounds to 3.50</li>
  <li>3.50 &lt; n &lt; 3.75 : rounds to 3.75</li>
  <li>3.75 &lt; n &lt; 4.00 : rounds to 4.00</li>
  </ul>
  
  <p>I have managed to round to next integer like this.</p>
  
  <pre><code> double roundOff = Math.ceil(val)
  </code></pre>
  
  <p>I need the to know how to handle values below the x.75 threshold. </p>