#include <iostream>
#include <math.h>
using namespace std;
/*2.编写一个基类 Shape,有计算面积显示面积的area(兩数，利用派生类正方形Square、
十酒
圆形Circle以及圆柱体Cylinder类分别计算面积，均含有area(0兩数，要求有带参数的
小茧，
构造函数，编写主函数并测试(使用虑函数area0和基类Shape 指针实现多态，计算并
显示对应图形的面积)。e
 */
//Shape.h 基类
class Shape {
public:
    virtual double area();
};
//Shape.app
double Shape::area()
{
    return 0.0;
}
//Square.h
class Square:public Shape{
public:
    Square(int sideLength);
    virtual double area();
private:
    int sideLength;
};
//Square.cpp
Square::Square(int sideLength):Shape()
{
    this->sideLength = sideLength;
}
double Square::area()
{
    double area=pow(double(sideLength),2);
    cout<<"Square area ="<<area<<endl;
    return area;
}
//Circle.h
class Circle:public Shape{
public :
    Circle(int r);
    virtual double area();

private:
    int r;
    float Pi =3.14;
};
//Circle.cpp
Circle::Circle(int r): Shape(){
    this->r=r;
};
double Circle::area() {
    double area=Pi* pow(r,2);
    cout<<"Circle area ="<<area<<endl;
    return area;
}

//Cylinder.h
class Cylinder:public Shape{
public:
    Cylinder(int r,int height);
    virtual double area();

private:
    int r;
    int height;
    float Pi=3.14;

};
//Cylinder.cpp
Cylinder::Cylinder(int r, int height) {
    this->r=r;
    this->height=height;
}
double Cylinder::area() {
    double area =2*Pi*r*height+2*Pi*(pow(r,2));
    cout<<"Cylinder area ="<<area<<endl;
    return area;
}

int main( )
{
    Shape *shape;
    Square square(10);
    Circle circle(10);
    Cylinder cylinder(10,10);
//正方形
    shape=&square;
    shape->area();
//圆形
    shape=&circle;
    shape->area();
//圆柱体
    shape=&cylinder;
    shape->area();
    return 0;
}

artist

#include <string>
#include <iostream>
using namespace std;
/*
四、编程题(第1题20分，第二题12分，共32分) 4
1. 创建一个顶层基类Artist, 其中有name和age两个属性以及show(兩数用来显示
各项属性值;按着创建两个派生类Actor 和Singer,并增加额外的fansAmount和income
属性，并且也具有show0函数:最后使用Actor和Singer类派生出一个底层派生类Star,
并额外增加一个属性forbesRank, 并且包含show0函数;请使用虚基类来避免多级及
Anc
多重继承后出现的二义性，在main函数中分别创建Artist类对象、Aclor类对象、Singer
类对象以及一个Star类对象，并分别使川show0函数显示其各项数据。4
*/
//Artist.h
class Artist {
public :
    Artist( string  name,int age);
    void show();
    string name;
    int age;
};
//Artist.cpp
Artist::Artist( string  name,int age){
    this->name = name;
    this->age = age;
}
void Artist::show() {
    cout<<"Artist name="<<name<<"age="<<age<<endl;
}
//Actor.h
class Actor:virtual public Artist{
public:
    Actor(string  name, int age,long fansAmount, double income);
    void show();
    long fansAmount;
    double income;
};
//Actor.cpp
Actor::Actor(string  name, int age, long fansAmount, double income) : Artist(name,age) {
    this->fansAmount=fansAmount;
    this->income=income;
}
void Actor::show() {
    cout<<"Actor name="<<name<<"age="<<age<<"fansAmount="<<fansAmount<<"income="<<income<<endl;
}

//Singer.h
class Singer:virtual public Artist{
public:
    Singer( string  name,  int age, long fansAmount, double income);
    void show();

    long fansAmount;
    double income;
};
//Singer.cpp
Singer::Singer(string  name,  int age, long fansAmount, double income) : Artist(name,age) {
    this->fansAmount=fansAmount;
    this->income=income;
}
void Singer::show() {
    cout<<"Actor name="<<name<<"age="<<age<<"fansAmount="<<fansAmount<<"income="<<income<<endl;
}
//Star.h
class Star:virtual public Actor,virtual public Singer{
public:
    Star(string  name,int age, long fansAmount, double income,int rank);
    void show();
private:
    int ForbesRank;
};
//Star.cpp
Star::Star(string  name,int age, long fansAmount, double income,int rank)
        :Artist(name,age),
         Actor(name,age,fansAmount,income),
         Singer(name,age,fansAmount,income){
    ForbesRank = rank;
}
void Star::show(){
    cout<<"Star name="<<name<<"age="<<age<<"fansAmount="<<Actor::fansAmount<<"income="<<Singer::income<<"rank="<<ForbesRank<<endl;
}
int main() {
    Artist artist("测试",132);
    artist.show();
    Actor actor("刘德华",57,600,0.7f);
    actor.show();
    Singer singer("刘德华",57,100,0.58f);
    singer.show();
    Star star("刘德华", 57, 1000, 1.28f, 27);
    star.show();
    return 0;
}