title: n & (n-1) what does this expression do?
body: <blockquote>
    <p><strong>Possible Duplicates:</strong><br>
    <a href="https://stackoverflow.com/questions/666647/query-about-working-out-whether-number-is-a-power-of-2">Query about working out whether number is a power of 2</a><br>
    <a href="https://stackoverflow.com/questions/3265942/what-does-this-function-do">What does this function do?</a>  </p>
  </blockquote>
  
  
  
  <p><code>n &amp; (n-1)</code> - where can this expression be used ?</p>