Unable to add string into an mutable array - objective-c

Question

I am trying to upload assignments into a table in an different view controller. First when i click on the upload button this code runs.
- (IBAction)uploadAssignment:(id)sender {
nameOfAssignmentAsString = self.nameOfAssignment.text;
NSLog(#"%#", nameOfAssignmentAsString);
NSInteger row;
row = [self.subjectPicker selectedRowInComponent:0];
subjectOfAssignmentAsString = [subjectArray objectAtIndex:row];
NSLog(#"%#", subjectOfAssignmentAsString);
NSDate *deadline = [self.deadlinePicker date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd/MM/yyyy"];
deadlineOfAssignmentAsString = [dateFormat stringFromDate:deadline];
NSLog(#"%#",deadlineOfAssignmentAsString);
HomeworkViewController *HVC;
[HVC.nameOfAssignmentInAnArray addObject:nameOfAssignmentAsString];
[HVC.SubjectOfAssignmentInAnArray addObject:subjectOfAssignmentAsString];
[HVC.deadlineOfAssignmentInAnArray addObject:deadlineOfAssignmentAsString];
NSLog(#"%#",HVC.nameOfAssignmentInAnArray.count);
}
then in my HomeworkViewController.h this is the code
#interface HomeworkViewController : UIViewController <UIGestureRecognizerDelegate,UITableViewDataSource,UITableViewDelegate> {
int i;
}
#property (strong, nonatomic) IBOutlet UIView *mainMenu;
#property (strong, nonatomic) IBOutlet UIButton *homeworkButton;
#property (strong, nonatomic) IBOutlet UIButton *uploadButton;
#property (strong, nonatomic) NSMutableArray *nameOfAssignmentInAnArray;
#property (strong, nonatomic) NSMutableArray *SubjectOfAssignmentInAnArray;
#property (strong, nonatomic) NSMutableArray *deadlineOfAssignmentInAnArray;
I did initialise it in my HomeworkViewController.m file. But for some reason the string is not being added into the array.

Answer 1

You declare HVC but never assign a value to it. Therefore it cannot hold anything in itself. But for some reason the designers of Objective-C decided it's not an error to send messages to nil objects, so this might not be noticed.