#include <iostream>
using namespace std;
// 抽象类
class Box{
public:
    // 纯虚函数
    virtual double getVolume() = 0;
private:
    double length;
    double breadth;
    double height;
};
int main(){

    return 0;
}

#include <iostream>
using namespace std;
//基类
class Shape{
public:
    // 提供接口,纯虚函数
    virtual int getArea()=0;
    void setWidth(int width){
        this->width = width;
    };
    void setHeight(int height){
        this->height = height;
    };
protected:
    int width;
    int height;
};
// 派生类
class Rectangle:public Shape
{
public:
    int getArea(){
        return this->width*this->height;
    }
};
class Triangle:public Shape{
public:
    int getArea(){
        return (this->width*this->height)/2.;

    }


};

int main(){
    Rectangle rect;
    Triangle ti;
    rect.setWidth(5);
    rect.setHeight(7);

    cout<<"Total Rectangle area:"<<rect.getArea()<<endl;
    ti.setWidth(5);
    ti.setHeight(7);

    cout<<"Total Triangle area:"<<ti.getArea()<<endl;

    return 0;
}