title: Simulate int variables with byte or short
body: <p>As you know there is no <code>int</code> variable on JavaCard 2.2.x. I need integer variables for the applet I'm developing. </p>
  
  <p>I want to know how to simulate an <code>int</code> variable and its arithmetic using <code>byte</code> and <code>short</code> variables.</p>