title: how to convert lower case character to upper case?
body: <pre><code>unichar c;
  
  c = [myString characterAtIndex:0];
  
  unichar catchcar = [c lowercaseString];
  </code></pre>
  
  <p>error : invalid reciever type unicar.</p>
  
  <p>I know <code>lowercaseString</code> is used to covert String not character. Is there any solution?</p>