title: How to format a QString?
body: <p>I'd like to format a string for Qt label, I'm programming in C++ on Qt.</p>
  
  <p>In ObjC I would write something like: </p>
  
  <pre><code>NSString *format=[NSString stringWithFormat: ... ];
  </code></pre>
  
  <p>How to do something like that in Qt?</p>