Using cin with vector and class

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C++

C++98

What are the best ways to use cin with class using vector.push_back function?
I know if it's normal vector I can do it like this and then use a sentinel code to prompt the end

int myint;
vector<int> y;
cout << "vector integer" << endl;
while ((cin >> myint) && myint != 9999)
    y.push_back(myint);
for (int i = 0; i < y.size(); i++)
    cout << "y = " << y[i] << endl;*

Here's my code:

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;

class Account{
protected:
    int accno;
    double balance;
public:
    Account(int accno, double balance) : accno(accno), balance(balance){};
    double getBalance() {return balance;}
    void setBalance(double balance){ this->balance=balance; }
    int getAccno() {return accno;}
    void setAccno(int accno){ this->accno=accno; }
    void deposit(double amount){
        balance = balance + amount;
    }
};

class Saving : public Account{
public:
    Saving () : Account(accno,balance){};
    Saving (int accno, double balance) : Account(accno,balance){};
    bool withdraw (double amount){
        if (balance < amount){
            cout << "Insufficient funds";
            return false;
        }
        else{
            balance = balance - amount;
            return true;
        }
    }
    void compute_interest(){
        balance = balance * 1.05;
    }
    void print(){
        cout << "ID: " << accno << "     balance: " << balance << endl;
    }

    friend istream& operator >>(istream& input, Saving& account){
        cout << "ID: ";
        input >> account.accno;
        cout << "balance: ";
        input >> account.balance;
        return input;
    }
    friend ostream& operator <<(ostream& output, const Saving& account){
        output << "ID: " << account.accno << "     balance: " << account.balance << endl;
    }
    //friend bool operator !=(Saving a, int b)

};

int main()
{
    Saving saving[5];
    cout << "saving array" << endl;
    for (int i = 0; i < 5; i++){
        cin >> saving[i];
        saving[i].print();
        cout << endl;
    }

    Saving myvec;
    vector<Saving> savingV;
    cout << "saving vector" << endl;

    while ((cin >> myvec) && (myvec.getAccno() != 9999)){
        int i = 0;
        savingV.push_back(myvec);
        savingV[i].print();
        cout << endl;
        i++;
    }

    return 0;
}

As you can see in the main function i tested first using an array.
Basically what I really want to do using cin with class(vector not array) is to keep inserting value until a sentinel value or character or string is prompted.

& I'm still having trouble designing operator overloading functions (like the !=)
This is what I thought of doing by overloading the "!=" operator

while ((cin >> myvec) && myvec != 9999);

But idk whether it can be done.

What I have tried:

do{
int i = 0;
cin >> myvec;
savingV.push_back(myvec);
savingV[i].print();
cout << endl;
i++;
} while (cin >> myvec && ((myvec.getAccno() != 9999) || (myvec.getBalance() != 9999)));