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

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问题 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
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)f)
  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()f return Seat-Num;);
};
//********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)virtual (3)virtual (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vehicle作为虚基类,避免二义性问题。因此在这里添加virtual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:public bicycle,public motorcar。
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