12.3

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#include <iostream>#include<conio.h>#include <windows.h>using namespace std;enum vehicleStaus {rest, running};  //车辆状态：泊车、行进class vehicle //车辆类{protected:    int maxSpeed;//最大车速    int currentSpeed;//当前速度    int weight;//车重    vehicleStaus status; //rest-泊车状态；running-行进状态public:    vehicle(int maxS, int w); //构造函数，初始时，当前速度总为0且处在停车状态    void start();  //由rest状态到running, 初速为1    void stop(); //由running状态到rest, 当前速度小于5时，才允许停车    void speed_up();  //加速，调用1次，速度加1    void slow_down(); //减速，调用1次，速度减1，速度为0时，停车};vehicle::vehicle(int maxS, int w):maxSpeed(maxS), currentSpeed(0),weight(w), status(rest) {}void vehicle::start(){    if(status==rest)    {currentSpeed=1;    status=running;}    else    cout<<"您已经启动了！"<<endl;}void vehicle::stop(){    if(status==running)    if (currentSpeed<5)    {status=rest;    currentSpeed=0;}    else    cout<<"您当前速度太快无法停车，请减速慢行之后再停车！"<<endl;    else    cout<<"您还未启动，无法停车！"<<endl;}void vehicle::speed_up(){     if (status==running)        if(currentSpeed<maxSpeed)            ++currentSpeed;        else            cout<<"请不要超速行驶……"<<endl;    else        cout<<"车辆未启动！"<<endl;}void vehicle::slow_down(){    if(status==rest)    cout<<"车辆未启动！"<<endl;    else    --currentSpeed;}class bicycle:virtual public vehicle//(1）自行车类的虚基类为车辆类{protected:    double height; //车高public:    bicycle(int maxS=10, int w=50, int h=0.7);   //定义构造函数};bicycle::bicycle(int maxS, int w, int h):vehicle(maxS, w),height(h) {}class motorcar : virtual public vehicle //（2）机动车类的虚基类也为车辆类{protected:    int seatNum; //座位数    int passengerNum; //乘客人数public:    motorcar(int maxS=150, int w=1500, int s=5, int p=1);   //定义构造函数    void addPassenger(int p=1);      //增加搭载的乘客，超员要拒载，有人下车时，p为负数。当然车上乘客至少有1个（司机）。只有车停稳后才能上下客。};motorcar::motorcar(int maxS, int w, int s, int p):vehicle(maxS,w),seatNum(s),passengerNum(p){} //定义构造函数void motorcar::addPassenger(int p) //增加搭载的乘客，超员要拒载，有人下车时，p为负数。当然车上乘客至少有1个（司机）。只有车停稳后才能{    if(status==running)    cout<<"请停稳之后再上下车！"<<endl;    else if(passengerNum>seatNum)    {passengerNum=seatNum;    cout<<"涉嫌超员，已清理后达到最大人数请不要再超载！"<<endl;}    else if(passengerNum<1)    {passengerNum=1;    cout<<"请司机不要离开岗位！"<<endl;}    else    passengerNum+=p;}class motorcycle: public bicycle,public motorcar   //（3）摩托车类的基类为自行车类和机动车类{public:    motorcycle(int maxS=90, int w=100, int s=3, int p=1, int h=0.7);//定义构造函数    void show(); //显示摩托车的运行状态};motorcycle::motorcycle(int maxS, int w, int s, int p, int h):vehicle(maxS, w),bicycle(maxS, w, h),motorcar(maxS, w, s, p) {}//定义构造函数void motorcycle::show(){    cout<<"摩托车的状态为："<<endl;    if(status==rest)    cout<<"停泊！"<<endl;    else    cout<<"行进中！"<<endl;   cout<<"车速："<<currentSpeed<<" / "<< maxSpeed <<"\t当前乘员："<<passengerNum<<" / "<< seatNum << endl;}int main( ){    motorcycle m;    bool end=false;    while (!end)    {        cout<<"请操作：1-启动  2-加速  3-减速  4-有人上车  5-有人下车  6-停车 0-结束"<<endl;        char keydown= _getch(); //_getch()返回键盘上读取的字符        switch(keydown)        {        case '1':            cout<<"选中的操作是1-启动\t";            m.start();            break;        case '2':            cout<<"选中的操作是2-加速\t";            m.speed_up();            break;        case '3':            cout<<"选中的操作是3-减速\t";            m.slow_down();            break;        case '4':            cout<<"选中的操作是4-有人上车\t";            m.addPassenger(2);            break;        case '5':            cout<<"选中的操作是5-有人下车\t";            m.addPassenger(-1);            break;        case '6':            cout<<"选中的操作是6-停车\t";            m.stop();            break;        case '0':            end=true;            break;        }        m.show();        cout<<endl;        Sleep(200);  //要包含头文件<windows.h>    }    return 0;}
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