title: Convert a char to double
body: <p>Ok, I have a <code>char</code> that is a number. How could I convert it into a <code>double</code>?</p>
  
  <pre><code>char c;
  </code></pre>
  
  <p>I've tried <code>(double)c</code>, but it converts to zero.</p>
  
  <p>Any ideas?</p>