Bank Account iOS App Structure - ios

Question

Last semester in an assignment the class had to model a bank account in C++. This semester we are doing the same thing except in objective-c and in the form of an iOS app. I've just begun and have a basic storyboard set up to test my deposits however I cannot get my total balance to add up and I'm pretty sure it is because I instantiate my Account object with the deposit IBAction. How should this be done properly? I only need a push in the right direction and I'm confident I can hit the ground running from there with the rest. See attached code:
- (IBAction)deposit:(id)sender {
Account *acc =[[Account alloc]init];
double damount = [_textField.text doubleValue] ;
[acc deposit:(damount)];
_display.text = [NSString stringWithFormat:#"%f", acc.getBalance];
}
Original C++ code as requested:
int main(){
char szFName[32];
char szLName[32];
char szSIN[12];
char szAccType[10];
double dBalance;
int op;
Account *acc[MAX_ACCOUNTS];
int count=0;
while (count<MAX_ACCOUNTS)
{
cout << "Customer's First Name : " << flush;
cin >> szFName;
cout << "Customer's Last Name : " << flush;
cin >> szLName;
cout << "Customer's SIN : " << flush;
cin >> szSIN;
cout << "Account Type : " << flush;
cin >> szAccType;
cout << "Opening Balance : " << flush;
cin >> dBalance;
if ( !strcmp(szAccType,"Checking") )
acc[count] = new CheckingAcc(szFName, szLName, szSIN, szAccType, dBalance);
else if ( !strcmp(szAccType,"VIP") )
acc[count] = new VIPAcc(szFName, szLName, szSIN, szAccType, dBalance);
else if ( !strcmp(szAccType,"Saving") )
acc[count] = new SavingAcc(szFName, szLName, szSIN, szAccType, dBalance);
else
{
cout << "Incorect account type." << endl;
continue;
}
count++;
}

Answer 1

The problem you're facing is that you're creating a new bank account every time instead of maintaining a single account and adding to it.
In your original program you created an array of accounts acc that persisted during the lifetime of the user input. Since you've moved from a procedural program to a UI program with a run loop, you'll need a more persistent place to store it.
Generally, a good spot would be a property on your view controller or higher up if the objects need to persist longer than the view controller:
#property Account *account;
...
- (id)init
{
if (self) {
_account = [[Account alloc] init];
}
return self;
}
...
[self.account deposit:(damount)];
Since this is for class, you will probably want to review your textbook for topics like properties and instance variables.