操作题 1.  请使用VC6或使用[答题]菜单打开考生文件夹proj2下的工程proj2，其中定义了vehicle类，并派生出motorcar类和bicycle类。然后以motorcar和bicycle作为基类，再派生出motorcycle类。要求将vehicle作为虚基类，避免二义性问题。请在程序中的横线处填写适当的代码并删除横线，以实现上述类定义。此程序的正确输出结果应为：
    80
    150
    100
    1
    注意：只能在横线处填写适当的代码，不要改动程序中的其他内容，也不要删除或移动“//  ****found****”。
    #include ＜iostream.h＞
    class vehicle
    {
    private:
    int MaxSpeed;
    int Weight;
    public:
    //**********found**********
    vehicle (int maxspeed,intweight):______
    ～vehicle(){};
    int getMaxSpeed(){return MaxSpeed;}
    int getWeight(){return Weight;}
    };
    //**********found**********
    class bicycle:______public vehicle
    {
    private:
    int Height;
    public:
    bicycle(int maxspeed,int weight,int height):vehicle(maxspeed,weight),Height(height){}
    int getHeight(){return Height;};
    };
    //**********found**********
    class motorcar:______public vehicle
    {
    private:
    int SeatNum;
    public:
    motorcar(int maxspeed,int weight,int seatnum):vehicle(maxspeed,weight),SeatNum(seatnum){}
    int getSeatNum(){return SeatNum;};
    };
    //**********found**********
    class motorcycle:______
    {
    public:
    motorcycle(int maxspeed,intweight,int height):vehicle (maxspeed,weight),bicycle(maxspeed,weight,height),motorcar(maxspeed,weight,1){}
    };
    void main ()
    {
    motorcycle a(80,150,100);
    cout＜＜a.getMaxSpeed()＜＜endl;
    cout＜＜a.getWeight()＜＜endl;
    cout＜＜a.getHeight()＜＜endl;
    cout＜＜a.getSeatNum()＜＜endl;
    }