iphone - how can i check NSNumber is null? - 


 nsdictionary *regiondict = (nsdictionary *) region;             nsnumber *lat = [regiondict objectforkey:@"lat"];             //[latitude addobject:lat];             nsnumber *lng = [regiondict objectforkey:@"lng"];             //[longitude addobject:lng];             nslog(@"%@%@%@",lat,lng,titles);              if(lat == [nsnumber numberwithfloat:0.00]  && lng == [nsnumber numberwithfloat:0.00])             {                 nslog(@"%@%@%@",lat,lng,titles);             }             else             {                 cllocationcoordinate2d coord;                 coord.latitude =lat.doublevalue;                 coord.longitude =lng.doublevalue;                 mapviewannotation *annotation =[[mapviewannotation alloc]initwithtitle:titles andcoordinate:coord];                 [self.mapview addannotation:annotation];             }

if condition not satisfied because of nsnumber not check null value. way can check? tell me possible ways.. checking null.

you can check if object null doing

if ([myobject iskindofclass:[nsnull class]])

but if want check if float boxed in nsnumber zero, can do

if (lng.floatvalue == 0. && lat.floatvalue == 0)

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