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;

}