YTU 2622: B 虚拟继承（虚基类）-沙发床（改错题）

2622: B 虚拟继承（虚基类）-沙发床（改错题）

时间限制: 1 Sec  

内存限制: 128 MB

提交: 487  

解决: 393

题目描述

 有一种特殊的床，既能当床(Bed)用又能当沙发(Sofa)用，所以叫沙发床(SleeperSofa)。

同时床和沙发又是一种特殊的家具(Furniture)，具有一切家具的特性。

利用虚拟继承（虚基类）建立一个类的多重继承,沙发床继承了床和沙发的特性。

下面的程序中，在begin到end部分存在语法错误。请改正错误，使程序按下面输入输出的规定运行。

注意：只提交修改过的begin到end部分的代码。

#include <iostream>
 using namespace std; //家具类Furniture
 class Furniture
 {
 public:
 Furniture(double w)
 { weight=w; }
 void display()
 {
 cout<<"weight:"<<weight<<endl;
 }
 protected:
 double weight; //家具重量
 };//******************** begin ********************
 //床类Bed
 class Bed: public Furniture
 {
 public:
 Bed(double we,double l,double wi):Furniture(we),length(l),width(wi){}
 void display()
 { 
 cout<<"length:"<<length<<endl;
 cout<<"width:"<<width<<endl;
 }
 protected:
 double length; //床的长
 double width; //床的宽 
 }; //沙发类Sofa
 class Sofa: public Furniture
 { public:
 Sofa(double w,double h):Furniture(w),height(h){}
 void display()
 {
 cout<<"height:"<<height<<endl;
 }
 protected:
 double height; //沙发的高度 
 }; //沙发床
 class SleeperSofa:public Bed, public Sofa
 {public: 
 SleeperSofa(double we,double l,double wi,double h):Bed(we,l,wi),Sofa(we,h){ }
 void display()
 { 
 cout<<"weight:"<<weight<<endl;
 Bed::display();
 Sofa::display();
 }
 };//********************* end ********************
 int main()
 {
 double weight,length,width,height;
 cin>>weight>>length>>width>>height; SleeperSofa ss(weight,length,width,height);
 ss.display();

 return 0;
 }      

输入

依次输入沙发床的重量、长、宽、高  

输出

依次输出沙发床的重量、长、宽、高

样例输入

200 1.8 1.5 1.2      

样例输出

weight:200
length:1.8
width:1.5
height:1.2      

提示

改错思路有多种，只要程序能运行出正确结果，怎样改错都可以

迷失在幽谷中的鸟儿，独自飞翔在这偌大的天地间，却不知自己该飞往何方……

#include <iostream>
using namespace std;
//家具类Furniture
class Furniture
{
public:
    Furniture(double w)
    {
        weight=w;
    }
    void display()
    {
        cout<<"weight:"<<weight<<endl;
    }
protected:
    double weight; //家具重量
};
//床类Bed
class Bed: public Furniture
{
public:
    Bed(double we,double l,double wi):Furniture(we),length(l),width(wi) {}
    void display()
    {
        cout<<"length:"<<length<<endl;
        cout<<"width:"<<width<<endl;
    }
protected:
    double length; //床的长
    double width; //床的宽
};
//沙发类Sofa
class Sofa: public Furniture
{
public:
    Sofa(double w,double h):Furniture(w),height(h) {}
    void display()
    {
        cout<<"height:"<<height<<endl;
    }
protected:
    double height; //沙发的高度
};
//沙发床
class SleeperSofa:public Bed, public Sofa,public Furniture
{
public:
    SleeperSofa(double we,double l,double wi,double h):Bed(we,l,wi),Sofa(we,h),Furniture(we) { }
    void display()
    {
        cout<<"weight:"<<weight<<endl;
        Bed::display();
        Sofa::display();
    }
protected:
    double weight=200;
};
int main()
{
    double weight,length,width,height;
    cin>>weight>>length>>width>>height;
    SleeperSofa ss(weight,length,width,height);
    ss.display();
    return 0;
}