该系统具有以下功能：

- 停车：输入车牌号和进入时间，自动分配停车位编号，如果停车场已满则提示停车场已满。

- 离开停车场结算停车费用：输入停车位编号和离开时间，自动计算停车费用，如果已结算则提示已结算。

- 显示停车记录：按照停车位编号顺序显示停车记录，包括车牌号、进入时间、离开时间和停车费用。

- 退出系统：结束程序。

该程序通过使用 vector 存储停车记录，动态分配停车位编号，并通过 switch-case 语句实现菜单选择功能。

#include <iostream>
#include <vector>
#include <string>
using namespace std;const int MAX_CAPACITY = 100;// 停车记录结构体
struct ParkingRecord {int id;                 // 停车位编号string licensePlate;    // 车牌号int timeIn;             // 进入时间int timeOut;            // 离开时间float cost;             // 停车费用
};// 停车场类
class ParkingLot {
public:ParkingLot();// 显示菜单void showMenu();// 停车void parkCar();// 离开停车场结算停车费用void checkOutCar();// 显示停车记录void showParkingRecords();private:vector<ParkingRecord> parkingLot;   // 停车场int currentCapacity;                // 当前停车场容量
};// 构造函数
ParkingLot::ParkingLot() {currentCapacity = 0;
}// 显示菜单
void ParkingLot::showMenu() {cout << "Welcome to the Parking Lot Management System!" << endl;cout << "1. Park a car" << endl;cout << "2. Check out a car" << endl;cout << "3. Show parking records" << endl;cout << "4. Exit" << endl;cout << "Please enter your choice: ";
}// 停车
void ParkingLot::parkCar() {if (currentCapacity >= MAX_CAPACITY) {cout << "Sorry, the parking lot is full." << endl;return;}ParkingRecord newRecord;cout << "Please enter the license plate number (up to 9 characters): ";cin >> newRecord.licensePlate;cout << "Please enter the time in (in minutes since 00:00): ";cin >> newRecord.timeIn;newRecord.id = currentCapacity + 1;parkingLot.push_back(newRecord);currentCapacity++;cout << "The car is parked at spot " << newRecord.id << "." << endl;
}// 离开停车场结算停车费用
void ParkingLot::checkOutCar() {int id;cout << "Please enter the parking spot number: ";cin >> id;if (id < 1 || id > currentCapacity) {cout << "Invalid parking spot number." << endl;return;}ParkingRecord *record = &parkingLot[id-1];if (record->timeOut > 0) {cout << "The car has already been checked out." << endl;return;}cout << "Please enter the time out (in minutes since 00:00): ";cin >> record->timeOut;float hours = (record->timeOut - record->timeIn) / 60.0;record->cost = hours * 1.5;cout << "The cost for parking is $" << record->cost << "." << endl;
}// 显示停车记录
void ParkingLot::showParkingRecords() {if (currentCapacity == 0) {cout << "There is no car parked in the parking lot." << endl;return;}cout << "Parking records:" << endl;cout << "ID\tLicense Plate\tTime In\tTime Out\tCost" << endl;for (int i = 0; i < currentCapacity; i++) {ParkingRecord record = parkingLot[i];cout << record.id << "\t" << record.licensePlate << "\t\t" << record.timeIn << "\t" << record.timeOut << "\t" << record.cost << endl;}// 主函数
int main() {
ParkingLot parkingLot;
int choice;
do {parkingLot.showMenu();cin >> choice;switch (choice) {case 1:parkingLot.parkCar();break;case 2:parkingLot.checkOutCar();break;case 3:parkingLot.showParkingRecords();break;case 4:cout << "Thank you for using the Parking Lot Management System." << endl;break;default:cout << "Invalid choice." << endl;break;}cout << endl;
} while (choice != 4);return 0;