title: Nested case statements
body: <p>Can some one please explain the nesting of <code>case</code> statements into another. I'm referring to the  <a href="http://en.wikipedia.org/wiki/Duff%27s_device" rel="nofollow">Duffs Device</a> where all other <code>case</code> statements are inside the <code>do-while</code> loop associated with <code>case 0</code>. I cant get my head around it. It seems to me that it should act like a nested <code>if</code>. But then i'm definitely missing something. Please explain.</p>