作业--day39

定义一个Person类，私有成员int age，string &name，定义一个Stu类，包含私有成员double *score，写出两个类的构造函数、析构函数、拷贝构造和拷贝赋值函数，完成对Person的运算符重载(算术运算符、条件运算符、逻辑运算符、自增自减运算符、插入/提取运算符)

#include <iostream>

using namespace std;

class Person{
    int age;
    string &name;
public:
    Person(string &name):age(15),name(name){}
    Person(int age, string &name):age(age),name(name){}
    ~Person(){
        cout << "Person的析构函数" << endl;
    }
    Person(const Person &other):age(other.age),name(other.name){}
    Person &operator=(const Person &other){
        age = other.age;
        name = other.name;
        return *this;
    }
    Person operator+(const Person other){
        string tempname = name + other.name;
        int tempage = age + other.age;
        return Person(tempage, tempname);
    }
    bool operator==(const Person other){
        return age==other.age && name==other.name;
    }
    bool operator>=(const Person other){
        return age>=other.age && name>=other.name;
    }
    Person operator++(){
        age++;
        return *this;
    }
    Person operator++(int){
        return Person(age++, name);
    }
    Person operator--(){
        age--;
        return *this;
    }
    Person operator--(int){
        return Person(age--, name);
    }
    friend istream &operator>>(istream &cin, Person &p);
    friend ostream &operator<<(ostream &cout, Person &p);
};

istream &operator>>(istream &cin, Person &p){
    cin >> p.age >> p.name;
    return cin;
}

ostream &operator<<(ostream &cout, Person &p){
    cout << "age=" << p.age << ", name=" << p.name;
    return cout;
}

class Stu{
  double * const score;
public:
  Stu():score(new double(12.0)){}
  Stu(double score):score(new double(score)){}
  ~Stu(){
      delete score;
      cout << "Stu的析构函数" << endl;
  }
  Stu(Stu &other):score(new double(*(other.score))){}
  Stu &operator=(Stu &other){
      *score = *other.score;
      return *this;
  }
  void show(){
      cout << *score << endl;
  }
};

int main()
{
    string name1 = "a";
    Person p1(name1);
    cin >> p1;
    Person p2 = p1;
    cout << p2 << endl;
    p2++;
    cout << p2 << endl;
    string name2 = "b";
    Person p3(name2);
    cout << p3 << endl;
    p3 = p2 + p1;
    cout << boolalpha << (p2 == p1) << endl;
    cout << (p2 >= p1) << endl;
    cout << p3 << endl;
    cout << "-----------" << endl;
    Stu s1;
    s1.show();
    Stu s2(16.5);
    s2.show();
    Stu s3 = s2;
    s3.show();
    s2 = s1;
    s2.show();
    return 0;
}

思维导图