You can use this code:
theCoordinate2.longitude = [[details.longarray objectAtIndex:0] stringByAppendingString:[details.longarray objectAtIndex:1];
//and so on for index 2,3,4 stringByAppendingString:[details.longarray objectAtIndex:2
NSLog(@"longitudes list from %f",theCoordinate2.longitude);
solved how to converts NSMutableArray values into NSString? [duplicate]