title: number followed by capital L
body: <p>What does <code>512L</code> mean? (or probably any number followed by capital L)</p>
  
  <p>example:</p>
  
  <p><code>uint sec</code>
  and then some code with the expression:
  <code>sec * 512L</code></p>
  
  <p>(taken out of the <a href="http://en.wikipedia.org/wiki/Xv6" rel="nofollow">XV6</a> code - mkfs.c)</p>