12.2虚基类骑摩托车

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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};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};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。};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};vehicle::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{    maxSpeed=maxS;    currentSpeed=0;    weight=w;}void vehicle::start()  //由rest状态到running, 初速为1{    if(status!=running)    {        cout<<"开始启动"<<endl;        status=running;        currentSpeed=1;    }    else        cout<<"当前已在形式状态"<<endl;}void vehicle::stop() //由running状态到rest, 当前速度小于5时,才允许停车{    if(currentSpeed>=5)        cout<<"汽车当前速度太快,无法立即停车"<<endl;    else    {        for(int i=currentSpeed; i>0; i--)            slow_down();    }}void vehicle::speed_up()  //加速,调用1次,速度加1{    if(currentSpeed<maxSpeed)        currentSpeed++;    else        cout<<"已经达到最大速度"<<endl;}void vehicle::slow_down() //减速,调用1次,速度减1,速度为0时,停车{    if(currentSpeed>0)        currentSpeed--;}bicycle::bicycle(int maxS, int w, int h):vehicle(maxS,w){    height=h;}motorcar::motorcar(int maxS, int w, int s, int p):vehicle(maxS,w){    seatNum=s;    passengerNum=p;}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)。只有车停稳后才能上下客。{    if(passengerNum<seatNum)    {        stop();        if(passengerNum+p<=seatNum)            passengerNum+=p;        else passengerNum=seatNum;    }    else    {        if(p<0)        {            stop();            passengerNum+=p;        }    }}motorcycle::motorcycle(int maxS, int w, int s, int p, int h):bicycle(maxS,w,h),motorcar(maxS,w,s,p),vehicle(maxS,w)//定义构造函数{}void motorcycle::show() //显示摩托车的运行状态{    if(status==running)        cout<<"当前为行驶:"<<endl;    else        cout<<"停车状态"<<endl;    cout<<"当前速度为:"<<currentSpeed<<endl;    cout<<"当前车总重量为:"<<weight<<endl;    cout<<"当前车人员数为:"<<passengerNum<<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();            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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