用c++设计一个公交车管理系统，公交车需设置不同的类型，每个线路的公交车会经过多个不同的车站，车站、公交车可设计成不同的类，给出某个公交车可以显示它所经过所有站点。 基本功能： （1）公交车要设置不同的类型，如电车、油车等； （2）公交车信息包括：车牌号，类型，线路号，座位数,长度，宽度，高度，油耗等；0 （3）公交车信息要保存在文件中； （4）系统可以实现对公交车和车站信息的添加，修改，删除，查找等功能； （5）系统界面应该尽量友好，方便使用。

以下是一个简单的公交车管理系统的设计，其中包含车站、公交车、线路等类。

#include <iostream>
#include <string>
#include <vector>
#include <fstream>

using namespace std;

// 车站类
class Station {
private:
    string name;  // 车站名称
public:
    Station(string n) : name(n) {}
    string getName() const { return name; }
};

// 公交车类
class Bus {
private:
    string plateNumber;  // 车牌号
    string type;  // 类型
    int routeNumber;  // 线路号
    int seatCount;  // 座位数
    double length;  // 长度
    double width;  // 宽度
    double height;  // 高度
    double fuelConsumption;  // 油耗
    vector<Station> stations;  // 经过的车站
public:
    Bus(string pn, string t, int rn, int sc, double l, double w, double h, double fc) :
        plateNumber(pn), type(t), routeNumber(rn), seatCount(sc), length(l), width(w), height(h),
        fuelConsumption(fc) {}
    string getPlateNumber() const { return plateNumber; }
    string getType() const { return type; }
    int getRouteNumber() const { return routeNumber; }
    int getSeatCount() const { return seatCount; }
    double getLength() const { return length; }
    double getWidth() const { return width; }
    double getHeight() const { return height; }
    double getFuelConsumption() const { return fuelConsumption; }
    void addStation(Station& s) { stations.push_back(s); }
    void printStations() const {
        cout << "Stations on route " << routeNumber << ":" << endl;
        for (const auto& s : stations) {
            cout << "- " << s.getName() << endl;
        }
    }
};

// 线路类
class Route {
private:
    int routeNumber;  // 线路号
    vector<Bus> buses;  // 该线路上的公交车
public:
    Route(int rn) : routeNumber(rn) {}
    void addBus(Bus& b) { buses.push_back(b); }
    void printBuses() const {
        cout << "Buses on route " << routeNumber << ":" << endl;
        for (const auto& b : buses) {
            cout << "- " << b.getPlateNumber() << " (" << b.getType() << ")" << endl;
        }
    }
};

// 公交车管理系统类
class BusManagementSystem {
private:
    vector<Bus> buses;  // 所有公交车
    vector<Station> stations;  // 所有车站
    vector<Route> routes;  // 所有线路
public:
    void addBus() {
        string pn, t;
        int rn, sc;
        double l, w, h, fc;
        cout << "Enter plate number: ";
        cin >> pn;
        cout << "Enter type: ";
        cin >> t;
        cout << "Enter route number: ";
        cin >> rn;
        cout << "Enter seat count: ";
        cin >> sc;
        cout << "Enter length: ";
        cin >> l;
        cout << "Enter width: ";
        cin >> w;
        cout << "Enter height: ";
        cin >> h;
        cout << "Enter fuel consumption: ";
        cin >> fc;
        Bus newBus(pn, t, rn, sc, l, w, h, fc);
        buses.push_back(newBus);
        cout << "New bus added." << endl;
    }
    void addStation() {
        string n;
        cout << "Enter station name: ";
        cin >> n;
        Station newStation(n);
        stations.push_back(newStation);
        cout << "New station added." << endl;
    }
    void addRoute() {
        int rn;
        cout << "Enter route number: ";
        cin >> rn;
        Route newRoute(rn);
        routes.push_back(newRoute);
        cout << "New route added." << endl;
    }
    void addBusToRoute() {
        string pn;
        int rn;
        cout << "Enter plate number of the bus: ";
        cin >> pn;
        cout << "Enter route number: ";
        cin >> rn;
        bool busFound = false;
        bool routeFound = false;
        for (auto& b : buses) {
            if (b.getPlateNumber() == pn) {
                busFound = true;
                for (auto& r : routes) {
                    if (r.getRouteNumber() == rn) {
                        routeFound = true;
                        r.addBus(b);
                        cout << "Bus " << pn << " added to route " << rn << "." << endl;
                        break;
                    }
                }
                if (!routeFound) {
                    cout << "Route " << rn << " not found." << endl;
                }
                break;
            }
        }
        if (!busFound) {
            cout << "Bus " << pn << " not found." << endl;
        }
    }
    void addStationToBus() {
        string pn;
        string sn;
        cout << "Enter plate number of the bus: ";
        cin >> pn;
        cout << "Enter station name: ";
        cin >> sn;
        bool busFound = false;
        bool stationFound = false;
        for (auto& b : buses) {
            if (b.getPlateNumber() == pn) {
                busFound = true;
                for (auto& s : stations) {
                    if (s.getName() == sn) {
                        stationFound = true;
                        b.addStation(s);
                        cout << "Station " << sn << " added to bus " << pn << "." << endl;
                        break;
                    }
                }
                if (!stationFound) {
                    cout << "Station " << sn << " not found." << endl;
                }
                break;
            }
        }
        if (!busFound) {
            cout << "Bus " << pn << " not found." << endl;
        }
    }
    void printStationsOnRoute() const {
        int rn;
        cout << "Enter route number: ";
        cin >> rn;
        bool routeFound = false;
        for (const auto& r : routes) {
            if (r.getRouteNumber() == rn) {
                routeFound = true;
                r.printBuses();
                cout << endl;
                for (const auto& b : r.buses) {
                    b.printStations();
                    cout << endl;
                }
                break;
            }
        }
        if (!routeFound) {
            cout << "Route " << rn << " not found." << endl;
        }
    }
};

int main() {
    BusManagementSystem bms;
    int choice;
    do {
        cout << "Bus management system menu:" << endl;
        cout << "1. Add bus" << endl;
        cout << "2. Add station" << endl;
        cout << "3. Add route" << endl;
        cout << "4. Add bus to route" << endl;
        cout << "5. Add station to bus" << endl;
        cout << "6. Print stations on route" << endl;
        cout << "0. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;
        switch (choice) {
        case 1:
            bms.addBus();
            break;
        case 2:
            bms.addStation();
            break;
        case 3:
            bms.addRoute();
            break;
        case 4:
            bms.addBusToRoute();
            break;
        case 5:
            bms.addStationToBus();
            break;
        case 6:
            bms.printStationsOnRoute();
            break;
        case 0:
            cout << "Goodbye!" << endl;
            break;
        default:
            cout << "Invalid choice." << endl;
            break;
        }
    } while (choice != 0);
    return 0;
}