}
         inf.close();    
         cout << "\nHere are all the cars that visited the lot today:\n";
         //Range an alphabetized list of all the cars
         sort(cars.begin(),cars.end(), compare);
         //display the ranged list
         for(vector<Car>::iterator iter = cars.begin(); iter != cars.end();iter ++){
             cout << (*iter).getPlate() << " in the " << (*iter).getAisle() <<\
                 " aisle moved " << (*iter).getTimesMoved() << " times " << endl;
         }
         // TODO: Output the license plates of all the
         // cars that visited the lot, in alphabetical order        
         return EXIT_SUCCESS;
     }
     catch (exception& e) {
         cerr << e.what() << endl;
     }
     catch (...) {
         cerr << "Unknown exception caught!" << endl;
     }
     return EXIT_FAILURE;
}
//compare two car'plate
bool compare(Car car_1, Car car_2){
     return car_1 < car_2;
}
void handle_arrival(vector<Car>& cars, vector< stack<string> >& parking_lot, const string& plate) {
     // TODO: Handle car departures
     int num = 0;
     //storage the car when the Parking Lot is not full. Judge information when it is full
     for(; num < parking_lot.size(); num++) {
         if((parking_lot[num]).size() < PARKING_SPOTS_PER_AISLE) {
             (parking_lot[num]).push(plate);
             cars.push_back(Car(plate,num));
             return;
         }
     }
     cout << "All five aisles are full!" << endl;
}
void handle_departure(vector<Car>& cars, vector< stack<string> >& parking_lot,


                       const string& plate)
{
     //define a depart car and another stack to storage car of top of parking_lot
     Car car_find = find_car(cars,plate);
     stack<string> cars_move;
     while(true)
     {
         //transfer the top car in the parking_lot
         Car &car_top = find_car(cars,parking_lot[car_find.getAisle()].top());
         if(car_top == car_find)
         { //find the top car is the departed car ,display and delete it.
             cout << plate << " in the " << car_top.getAisle() << " aisle moved " << \
                 car_top.getTimesMoved() << " times " << endl;
             parking_lot[car_top.getAisle()].pop();
             while(!cars_move.empty())
             {     //move the non-depart car back to former vector
                 parking_lot[car_find.getAisle()].push(cars_move.top());
                 cars_move.pop();
             }
             break;
         }
         else
         {    
             //find the top car isn't the departed car, move it to another stack,delete it.
             car_top.setTimesMoved(car_top.getTimesMoved() + 1);
             cars_move.push(parking_lot[car_find.getAisle()].top());
             parking_lot[car_find.getAisle()].pop();
         }
     }
}
Car& find_car(vector<Car>& cars, string plate) {
     //search the car with name plate in the cars vector
     vector<Car>::iterator iter = std::find(cars.begin (), cars.end (), Car(plate));
     if(iter == cars.end ()){//no found
         cerr<<"There is not the car."<<endl;
         exit(0);
     }else{//found
         return *iter;    
     }
}