функция проверки вводимого числа

int enter_n() {
 int n;
  while (true)
    {
        cout << "Enter a n value: ";
        cin >> n;
        if (cin.fail())
        {
            cin.clear();
            cin.ignore(32767,'\n');
            cout << "Oops, that input is invalid.  Please try again.\n";
        }
        else
        {
            cin.ignore(32767,'\n');

            return n;
        }
    }
}