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

admin2020-10-21  16

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<iostream.h>
class vehicle
{
private:
int MaxSpeed;
int Weight;
public:
//**********found**********
vehicle(int maxspeed,int
weight):_______
~vehicle( ){};
int getMaxSpeed( ){returnMaxSpeed;}
int getWeight( ){returnWeight;}
};
//**********found**********
class bicycle:_______publicvehicle
{
private:
int Height;
public:
bicycle(int maxspeed,intweight,int height):vehicle(maxspeed,weight),Height(height){}
int getHeight( ){returnHeight};
};
//**********found**********
class motorcar:_______public vehicle
{
private:
int SeatNum;
publiC:
motorcar(intmaxspeed,int weight,in tseatnum):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<<a.getMaxSpeed( )<<endl;
cout<<a.getWeight( )<<endl;
cout<<a.getHeight( )<<endl;
cout<<a.getSeatNum( )<<
endl;
}

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。
转载请注明原文地址:https://jikaoti.com/ti/Rhl0FFFM
0

最新回复(0)