title: converting double into NSNumber using [NSNumber numberWithDouble:]
body: <p>there is a coordinate object with three variables latitude(NSNumber) ,longitude(NSNumber) and time(NSDate),for checking the program on my simulator,i gave the folowing code</p>
  
  <pre><code>[coordinate setLatitude:[NSNumber numberWithDouble:23.234223]];
  [coordinate setLongitude:[NSNumber numberWithDouble:73.234323]];
  </code></pre>
  
  <p>however when i NSLog coordinate.latitude and coordinate.longitude,it diplays 0.00000</p>
  
  <pre><code>NSLog(@"cordlat :  %f",coordinate.latitude);
  NSLog(@"cordlong :  %f",coordinate.longitude);
  </code></pre>
  
  <p>what can be the problem???</p>