title: NSMutableArray add Object as pointer only?
body: <p>I have this little code</p>
  
  <pre><code> NSMutableArray *myArray = [[NSMutableArray alloc] init]; 
   NSNumber *myNumber = [NSNumber numberWithDouble:752.65];
  
   [myArray addObject:myNumber];
  </code></pre>
  
  <p>With this code I store Objects inside an array. But now I have two objects independent from each other.</p>
  
  <p>If I change myNumber after it's been added to the array the value inside the array does not change. How can I archive that? I tried to give a pointer only to the array but it did not work.</p>