title: Using a bitwise AND on more than two bits
body: <p>I am pretty new to bitwise operators. Let's say I have 3 variables <code>a</code>, <code>b</code> and <code>c</code>, with these values in binary:</p>
  
  <pre><code>  a = 0001
    b = 0011
    c = 1011
  </code></pre>
  
  <p>Now, I want to perform a bitwise AND like this:</p>
  
  <pre><code>    a
  AND b
  AND c
  --------
  d = 0001
  </code></pre>
  
  <p><code>d &amp;= a &amp;= b &amp;= c</code> doesn't work (as I expected), but how can I do this?
  Thanks</p>