title: What does << mean in C?
body: <p>Im having trouble understanding what &lt;&lt; means in C. Im supposed to explain some code as a homework assignment, but it's kinda difficult to find an answer by googling.</p>
  
  <p>It's related to programming a multi function shield connected to arduino (atmega328p chip)</p>
  
  <p>Here's the line:</p>
  
  <p>PORTB = ~(money &lt;&lt; 2);</p>