title: Using NSLog for debugging
body: <p>I have the following code snippet in my Xcode:</p>
  
  <pre><code>NSString *digit [[sender titlelabel] text];
  NSLog([digit]);
  </code></pre>
  
  <p>I tried to build the application and am getting the following warning message for the line <code>NSLog([digit]);</code></p>
  
  <pre><code>Warning: Format not a string literal and no format arguments
  </code></pre>
  
  <p>Can you advise me how I can resolve this warning message? What does the message actually mean?</p>