title: What does '<<' mean in C?
body: <p>what does this mean?</p>
  
  <pre><code>#define WS_RECURSIVE    (1 &lt;&lt; 0)
  </code></pre>
  
  <p>I understand that it will define <code>WS_Recursive (1 &lt;&lt; 0)</code> but what does <code>&lt;&lt;</code> mean?</p>
  
  <p>Thanks!</p>