title: "Char cannot be dereferenced" error
body: <p>I'm trying to use the char method <code>isLetter()</code>, which is supposed to return boolean value corresponding to whether the character is a letter. But when I call the method, I get an error stating that "char cannot be dereferenced." I don't know what it means to dereference a char or how to fix the error. the statement in question is:</p>
  
  <pre><code>if (ch.isLetter()) 
  {
  ....
  ....
  }
  </code></pre>
  
  <p>Any help? What does it mean to dereference a char and how do I avoid doing so?</p>