title: Declaring global variables in Objective-C
body: <p>I have a question about variable declaration in Objective-C</p>
  
  <p>in case of <code>global variable</code> what is the difference between declaration in the <code>.m</code> file and <code>.h</code> file?</p>
  
  <p>should i declare <code>property</code> for each variable in <code>.h</code> file?</p>