how to use a pointer in a Class

int main() {
    NumDays *days = new NumDays();
    double hours;
    cout << "Enter numberof hours worked and get working days.\n";
    cout<< "Enter 0 to terminate the sequence. \n";


    while (true) {
        cout << "Enter number of hours" << endl;
        cin >> hours;

        if (hours < 0) {
            cout << "Invalid input. Please try again." << endl;
            continue;
        }
        if (hours == 0) {
            cout << "Exiting..." <<endl;
            break;
        }
        days->setWorkingHours(hours);
        cout << hours << " working hours is " << days->getDays() << " working days." << endl;