#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) {}
//启动
void vehicle::start()
{
    if(status==rest)
    {
        status=running;
        currentSpeed=1;
    }
    else
        cout<<"车辆正在行驶！"<<endl;
}
void vehicle::stop()
{
    if(status=running)
    {
        if(currentSpeed<=5)
        {
            status=rest;
            currentSpeed=0;
        }
        else
            cout<<"车速太快，先减速在停止！"<<endl;
    }
    else
        cout<<"车辆未启动！"<<endl;
}
void vehicle::speed_up()
{
    if(status==running)
    {
        if(currentSpeed<maxSpeed)
            currentSpeed+=1;
        else
            cout<<"请不要超速行驶！"<<endl;
    }
    else
        cout<<"车辆未启队，请启动！"<<endl;
}
void vehicle::slow_down()
{
    if(status==running)
    {
        if(currentSpeed>0)
            currentSpeed-=1;
        else
            cout<<"车辆已停止！"<<endl;
    }
    if(currentSpeed==0)
    {
        status=rest;
    }
}
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) {}
void motorcar::addPassenger(int p)
{
    if(status==running)
    {
        cout<<"车辆行驶中，停车后再上车！";
    }
        else
    {
        passengerNum+=p;
        if(passengerNum>seatNum)
        {
            passengerNum=seatNum;
            cout<<"超载，请正常驾车！"<<endl;
        }
        else if(passengerNum<1)
        {
            passengerNum=1;
            cout<<"请驾驶员不要下车！"<<endl;
        }
    }
}
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){}
void motorcycle::show()
{
    cout<<"状态：";
    if(status==rest)
    cout<<"泊车;\t";
    else
    cout<<"行驶中;\t";
    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;
        cout<<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;
}

感悟：有点乱！！！