title: round double to 0.5
body: <p>i have a result "1.444444" and i want to round this result to "1.5" this is the code i use :</p>
  
  <pre><code>a.text = String(round(13000 / 9000.0))
  </code></pre>
  
  <p>but this is round to "1.0" and i need round to "1.5"</p>
  
  <p>and this code :</p>
  
  <pre><code>a.text = String(ceil(13000 / 9000.0))
  </code></pre>
  
  <p>is round to "2.0"</p>