title: Concatenating two QStrings with an integer
body: <p>I want to do something like this in C++ using Qt:</p>
  
  <pre><code>int i = 5;
  QString directory = ":/karim/pic" + i + ".jpg";
  </code></pre>
  
  <p>where <code>+</code> means I want to concatenate the strings and the integer (that is, <code>directory</code> should be <code>:/karim/pic5.jpg</code>). How can I do this?</p>