int main() { string flightFile = "flights.txt"; string userFile = "users.txt"; vector<Flight> flights = File

在管理员登录后，需要根据管理员的选择执行相应的操作。可以使用一个`while`循环来实现这个功能。具体代码如下： ```c++ if (admin.login()) { while (true) { cout << "Welcome, admin!" << endl; cout << "1. Display all flights" << endl; cout << "2. Add a new flight" << endl; cout << "3. Delete a flight" << endl; cout << "4. Modify a flight" << endl; cout << "5. Logout" << endl; int adminChoice; cin >> adminChoice; switch (adminChoice) { case 1: { // 显示所有航班信息 for (auto& flight : flights) { cout << flight << endl; } break; } case 2: { // 添加新航班 Flight newFlight = AdminUtil::addNewFlight(); flights.push_back(newFlight); FileUtil::writeFlightsToFile(flights, flightFile); cout << "New flight added successfully!" << endl; break; } case 3: { // 删除航班 string flightNumber = AdminUtil::getFlightNumber(); bool foundFlight = false; for (auto it = flights.begin(); it != flights.end(); ++it) { if (it->getFlightNumber() == flightNumber) { foundFlight = true; flights.erase(it); FileUtil::writeFlightsToFile(flights, flightFile); cout << "Flight deleted successfully!" << endl; break; } } if (!foundFlight) { cout << "Flight not found." << endl; } break; } case 4: { // 修改航班信息 string flightNumber = AdminUtil::getFlightNumber(); bool foundFlight = false; for (auto& flight : flights) { if (flight.getFlightNumber() == flightNumber) { foundFlight = true; AdminUtil::modifyFlight(flight); FileUtil::writeFlightsToFile(flights, flightFile); cout << "Flight modified successfully!" << endl; break; } } if (!foundFlight) { cout