title: Convert hex to decimal in swift
body: <p>how to convert hex to decimal in swift?</p>
  
  <p>I have string "423fdf4dfb1115" and I need get this => 18647576781459733.</p>
  
  <p>I try this:</p>
  
  <pre><code>let result = UInt8(strtoul("423fdf4dfb1115", nil, 16)) 
  </code></pre>
  
  <p>but app crash...</p>
  
  <p>I use this online convert:
  <a href="http://www.binaryhexconverter.com/hex-to-decimal-converter" rel="nofollow">http://www.binaryhexconverter.com/hex-to-decimal-converter</a></p>