请打开考生文件夹下的解决方案文件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

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问题 请打开考生文件夹下的解决方案文件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
class vehicle
{
private:
int MaxSpeed;
int Weight;
public:
//**********found**********
vehicle(int maxspeed,int weight):___________
~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,int weight,int height):vehicle(maxspeed,weight),bicycle(maxspeed,weight,
height),motorcar(maxspeed,weight,1){}
};
void main()
{
motorcycle a(80,150,100);
cout<cout<cout<cout<}

选项

答案(1)MaxSpeed(maxspeed),Weight(weight){}; (2)vinual (3)vinual (4)public bicycle,public motorcar

解析 (1)主要考查考生对构造函数的掌握,构造函数使用初始化列表来对私有成员MaxSpeed和Weight初始化。
(2)主要考查考生对派生类的掌握,题目要求将vehicIe作为虚基类,避免二义性问题。因此在这里添加vinual使vehicle成为虚基类。
(3)主要考查考生对派生类的掌握,题目要求以motorcar和bicycle作为基类,再派生出motorcycle类。在主函数中可以看到motorcycle类的实例a调用getHeight函数和getseatNum函数,由此可知这两个基类都是公有继承,因此得出语句:puhlic bicycle,public motorcar。
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