title: Converting a string with a hexadecimal representation of a number to an actual numeric value
body: <p>I have a string like this:</p>
  
  <pre><code>"00c4"
  </code></pre>
  
  <p>And I need to convert it to the numeric value that would be expressed by the literal:</p>
  
  <pre><code>0x00c4
  </code></pre>
  
  <p>How would I do it?</p>