title: Copy of NSDictionary to NSMutableDictionary
body: <p>I need to know that how can i make a copy of <code>NSDictionary</code> to <code>NSMutableDictionary</code> and change values of there.  </p>
  
  <p>Edit </p>
  
  <p>I ned to know how to modify data of a NSDictionary. I got to know that </p>
  
  <p>Copy data of <code>NSDictionary</code> to a <code>NSMutableDictionary</code>. and then modify data in <code>NSMutableDictionary</code></p>