title: What version of Objective-C am I using?
body: <p>How do I tell what version of <strong>Objective-C</strong> I'm using? I'm using a Mac with xCode. The reason I ask is because i have a book "<strong>Objective-C 3.0</strong>" and it says that you can declare an multidimensional array like this.</p>
  
  <p>int[,] num = new int[2,2];</p>
  
  <p>When I try to do this I get a syntax error. Do I need to import another header other than foundation?</p>