# C++ 长方体继承自矩形

C++ 长方体继承自矩形

#include <iostream>
using namespace std;
class Rectangle //矩形类
{
private:
int length; //矩形的长和宽
int width;
public:
Rectangle();
Rectangle(int l,int w); //构造函数，l、w分别代表长和宽
int getArea(); //求面积
};

class Bulk: public Rectangle //立方体类
{
public:
Bulk(); //默认构造函数
Bulk(int l, int w,int h); //带参数的构造函数
int getVolume();
private:
int height; //高，长、宽继承自基类
};

//只提交begin到end部分的代码

//*********** begin *************

//Rectangle类的成员函数
Rectangle::Rectangle():______(1)______ {}

Rectangle::Rectangle(int l,int w):______(2)______ {}

int Rectangle::getArea()
{
return ______(3)______;
}

//Bulk类的成员函数
Bulk::Bulk():______(4)______

Bulk::Bulk(int l, int w,int h):______(5)______

int Bulk::getVolume()
{
______(6)______
};

//*********** end ***************

int main()
{
int x,y,z;
cin>>x>>y>>z;
Bulk b(x,y,z);
cout<<b.getVolume()<<endl;
return 0;
}

``3 4 5``

``60``

``````#include<stdio.h>
int main()
{
int a,b,c;
scanf("%d %d %d",&a,&b,&c);
printf("%d",a*b*c);
}``````

``````
#include <iostream>
using namespace std;
class Rectangle   //矩形类
{
private:
int length;  //矩形的长和宽
int width;
public:
Rectangle();
Rectangle(int l,int w); //构造函数，l、w分别代表长和宽
int getArea();   //求面积
};

class Bulk: public Rectangle   //立方体类
{
public:
Bulk(); //默认构造函数
Bulk(int l, int w,int h); //带参数的构造函数
int  getVolume();
private:
int height;   //高，长、宽继承自基类
};Rectangle::Rectangle():length(0),width(0) {}

Rectangle::Rectangle(int l,int w):length(l),width(w) {}

int Rectangle::getArea()
{
return length*width;
}

//Bulk类的成员函数
Bulk::Bulk():Rectangle(0,0),height(0) {}

Bulk::Bulk(int l, int w,int h):Rectangle(l,w),height(h) {}

int Bulk::getVolume()
{
return getArea()*height;
};

int main()
{
int x,y,z;
cin>>x>>y>>z;
Bulk b(x,y,z);
cout<<b.getVolume()<<endl;
return 0;
}
``````