title: ARC or not to ARC iphone iOS5
body: <p>I have developed an iPhone application which should support iOS4 and iOS5 based iPhone/iPad.</p>
  
  <p>my application leaks memory at few places which is becoming hard to debug due to the size of code. I recently read about ARC (Automatic Reference Counting), my query is</p>
  
  <ol>
  <li><p>do i need to modify my source code (retain/release /alloc/dealloc) to compile with ARC.
  also what all changes we need to perform using ARC?</p></li>
  <li><p>is it advisable to shift to ARC?</p></li>
  <li><p>will my app work on iOS4 phone if i use ARC</p></li>
  </ol>
  
  <p>thanks. </p>