实验五：派生类和继承(二)(2)

金山学院C++课程实验报告

本题的代码如下：

#include<iostream.h>

const double pai=3.14;

class Shape

{public:double area()const{return 0.0;}

void display(){};

};

class twoDimShape:virtual public Shape

{};

class threeDimShape:virtual public Shape

{};

//三角形类

class Triangle:public twoDimShape

{public:Triangle(double myg,double myd){gao=myg;di=myd;}

double area ()const {return (di*gao)/2;}

void display(){cout<<"Area of Square is";}

private:double gao,di;

};

//正方形类

class Square:public twoDimShape

{public:Square(double myb){bianchang =myb;}

double area ()const {return bianchang*bianchang;}

void display(){cout<<"Area of Square is";}

private:double bianchang;

};

//正方体

class Squarer:public threeDimShape

{public:Squarer(double myb){bianchang =myb;}

double area ()const {return bianchang*bianchang*bianchang;}

void display(){cout<<"Superficial area of Cone is";}

private:double bianchang;

};

//球

class Ball:public threeDimShape

{public:Ball(double myr){r =myr;}

double area ()const {return (4*pai*r*r*r)/3;}

void display(){cout<<"Superficial area of Ball is";}

private:double r;

};

int main()

{ double a,b,c,d,e;

cout<<"请输入三角形的高和底"<<endl;

cin>>a>>b;

Triangle t(a,b);

double area;

area=t.area();