如何编写一个三层类函数并调用

Question

结合自身已经掌握的面向对象程序设计知识、C++算法知识、数学知识、物理知识、美术知识等，编写一个“MYWORLD”程序。
要求：（1）大致按照如下图的架构设计程序，其中类名只是个代号，大家需结合“见名知意”的原则从新命名；

（2）需满足纵向3层类，类An层至少需有3个类，类Bn层至少需有9个类的要求，让“MYWORLD”这个世界多姿多彩；
（3）需使用到算法，如：排序、求最大值、交换值等，可结合自身数学和物理知识，丰富程序的功能；
（4）尽可能的在程序中使用到如cout、cin、for、if、while、switch、构造函数、多态等所学到的知识。

Answer 1

#include <iostream>
#include <cstring>
#include <algorithm>
#include <vector>

using namespace std;

// 类An层

// 地球类
class Earth {
public:
  Earth(double radius, int population) : radius_(radius), population_(population) {}
  void SetPopulation(int population) { population_ = population; }
  void SetRadius(double radius) { radius_ = radius; }
  double GetRadius() { return radius_; }
  int GetPopulation() { return population_; }
private:
  double radius_;
  int population_;
};

// 太阳系类
class SolarSystem {
public:
  SolarSystem(string name, int number_of_planets) : name_(name), number_of_planets_(number_of_planets) {}
  void SetName(string name) { name_ = name; }
  void SetNumberOfPlanets(int number_of_planets) { number_of_planets_ = number_of_planets; }
  string GetName() { return name_; }
  int GetNumberOfPlanets() { return number_of_planets_; }
private:
  string name_;
  int number_of_planets_;
};

// 类Bn层

// 动物类
class Animal {
public:
  Animal(string name, string habitat) : name_(name), habitat_(habitat) {}
  void SetName(string name) { name_ = name; }
  void SetHabitat(string habitat) { habitat_ = habitat; }
  string GetName() { return name_; }
  string GetHabitat() { return habitat_; }
  virtual void MakeSound() = 0; // 纯虚函数
private:
  string name_;
  string habitat_;
};

// 人类类
class Human : public Animal {
public:
  Human(string name, string habitat, string language) : Animal(name, habitat), language_(language) {}
  void SetLanguage(string language) { language_ = language; }
  string GetLanguage() { return language_; }
  void MakeSound() { cout << "Hello, my name is " << GetName() << " and I speak " << language_ << endl; }
private:
  string language_;
};

// 鱼类
class Fish : public Animal {
public:
  Fish(string name, string habitat, string color) : Animal(name, habitat), color_(color) {}
  void SetColor(string color) { color_ = color; }
  string GetColor() { return color_; }
  void MakeSound() { cout << "Blub, blub" << endl; }
private:
  string color_;
};

// 其他类Bn

// 植物类
class Plant {
public:
Plant(string name, string habitat) : name_(name), habitat_(habitat) {}
void SetName(string name) { name_ = name; }
void SetHabitat(string habitat) { habitat_ = habitat; }
string GetName() { return name_; }
string GetHabitat() { return habitat_; }
virtual void Grow() = 0; // 纯虚函数
private:
string name_;
string habitat_;
};

// 花类
class Flower : public Plant {
public:
Flower(string name, string habitat, string color) : Plant(name, habitat), color_(color) {}
void SetColor(string color) { color_ = color; }
string GetColor() { return color_; }
void Grow() { cout << "I am a " << color_ << " flower and I am growing in the " << GetHabitat() << endl; }
private:
string color_;
};

// 树类
class Tree : public Plant {
public:
Tree(string name, string habitat, int age) : Plant(name, habitat), age_(age) {}
void SetAge(int age) { age_ = age; }
int GetAge() { return age_; }
void Grow() { cout << "I am a " << GetName() << " and I am " << age_ << " years old" << endl; }
private:
int age_;
};

// 类Cn层

// 城市类
class City {
public:
City(string name, int population) : name_(name), population_(population) {}
void SetName(string name) { name_ = name; }
void SetPopulation(int population) { population_ = population; }
string GetName() { return name_; }
int GetPopulation() { return population_; }
private:
string name_;
int population_;
};

// 国家类
class Country {
public:
Country(string name, int population, vector<City> cities) : name_(name), population_(population), cities_(cities) {}
void SetName(string name) { name_ = name; }
void SetPopulation(int population) { population_ = population; }
void SetCities(vector<City> cities) { cities_ = cities; }
string GetName() { return name_; }
int GetPopulation() { return population_; }
vector<City> GetCities() { return cities_; }
void SortCitiesByPopulation() {
sort(cities_.begin(), cities_.end(), [](const City& c1, const City& c2) { return c1.GetPopulation() < c2.GetPopulation(); });
}
City GetMostPopulatedCity() {
City most_populated_city = cities_[0];
for (const auto& city: cities_) {
if (city.GetPopulation() > most_populated_city.GetPopulation()) {
most_populated_city = city;
}
}
return most_populated_city;
}
private:
string name_;
int population_;
vector<City> cities_;
};
// 类Dn层

// 太空站类
class SpaceStation {
public:
SpaceStation(string name, int number_of_astronauts) : name_(name), number_of_astronauts_(number_of_astronauts) {}
void SetName(string name) { name_ = name; }
void SetNumberOfAstronauts(int number_of_astronauts) { number_of_astronauts_ = number_of_astronauts; }
string GetName() { return name_; }
int GetNumberOfAstronauts() { return number_of_astronauts_; }
private:
string name_;
int number_of_astronauts_;
};

// 飞船类
class Spaceship {
public:
Spaceship(string name, int number_of_astronauts) : name_(name), number_of_astronauts_(number_of_astronauts) {}
void SetName(string name) { name_ = name; }
void SetNumberOfAstronauts(int number_of_astronauts) { number_of_astronauts_ = number_of_astronauts; }
string GetName() { return name_; }
int GetNumberOfAstronauts() { return number_of_astronauts_; }
private:
string name_;
int number_of_astronauts_;
};

// 主函数
int main() {
// 创建地球对象
Earth earth(6371.0, 7000000000);
cout << "The radius of Earth is " << earth.GetRadius() << " km and the population is " << earth.GetPopulation() << endl;
earth.SetPopulation(7000000001);
cout << "The radius of Earth is " << earth.GetRadius() << " km and the population is " << earth.GetPopulation() << endl;

// 创建太阳系对象
SolarSystem solar_system("Solar System", 8);
cout << "The name of the solar system is " << solar_system.GetName() << " and it has " << solar_system.GetNumberOfPlanets() << " planets" << endl;
solar_system.SetName("Milky Way");
cout << "The name of the solar system is " << solar_system.GetName

// 创建图片对象
Image image("Sunset", 500, 500, "JPEG");
cout << "The name of the image is " << image.GetName() << " and the format is " << image.GetFormat() << endl;
image.SetName("Sunrise");
image.SetFormat("PNG");
cout << "The name of the image is " << image.GetName() << " and the format is " << image.GetFormat() << endl;

// 创建视频对象
Video video("Documentary", 3600, "MP4");
cout << "The name of the video is " << video.GetName() << " and the duration is " << video.GetDuration() << " seconds" << endl;
video.SetName("Movie");
video.SetDuration(7200);
cout << "The name of the video is " << video.GetName() << " and the duration is " << video.GetDuration() << " seconds" << endl;

// 创建音乐对象
Music music("Song", 180, "MP3");
cout << "The name of the music is " << music.GetName() << " and the duration is " << music.GetDuration() << " seconds" << endl;
music.SetName("Album");
music.SetDuration(3600);
cout << "The name of the music is " << music.GetName() << " and the duration is " << music.GetDuration() << " seconds" << endl;

// 创建时钟对象
Clock clock;
clock.timer();
return 0;
}