继承和构造函数析构函数调用顺序

迈不过友情╰ 2022-06-11 07:09 241阅读 0赞

//继承
    //代码的重用性
    using namespace std;
    
    /*
    //人类
    class Human{
    public:
    	void say(){
    		cout << "说话" << endl;
    	}
    protected:
    	char* name;
    	int age;
    };
    
    //男人
    class Man : public Human{
    public:
    	//泡妞
    	void chasing(){
    		cout << "泡妞" << endl;		
    	}
    private:
    	//兄弟
    	char* brother;
    };
    
    void work(Human& h){
    	h.say();
    }
    
    void main(){
    	Man m1;
    	m1.say();
    
    	//1.父类类型的引用或指针
    	Human* h_p = &m1;
    	h_p->say();
    
    	Human &h1 = m1;
    	h1.say();
    
    	//子类对象初始化父类类型的对象
    	Human h2 = m1;
    
    	system("pause");
    }
    */
    
    //向父类构造方法传参
    //人类
    /*
    class Human{
    public:
    	Human(char* name, int age){
    		this->name = name;
    		this->age = age;
    	}
    	void say(){
    		cout << "说话" << endl;
    	}
    protected:
    	char* name;
    	int age;
    };
    
    //男人
    class Man : public Human{
    public:
    	//给父类构造函数传参，同时给属性对象赋值
    	Man(char *brother, char *s_name, int s_age, char *h_name, int h_age) : Human(s_name, s_age), h(h_name,h_age){
    		this->brother = brother;
    	}
    	//泡妞
    	void chasing(){
    		cout << "泡妞" << endl;
    	}
    private:
    	//兄弟
    	char* brother;
    	Human h;
    };
    
    void main(){
    	Man m1("danny","jack",18,"jason",18);
    
    	system("pause");
    }
    */
    
    
    //构造函数与析构函数调用的顺序
    /*
    class Human{
    public:
    	Human(char* name, int age){
    		this->name = name;
    		this->age = age;
    		cout << "Human 构造函数" << endl;
    	}
    	~Human(){
    		cout << "Human 析构函数" << endl;
    	}
    	void say(){
    		cout << "说话" << endl;
    	}
    protected:
    	char* name;
    	int age;
    };
    
    //男人
    class Man : public Human{
    public:
    	//给父类构造函数传参，同时给属性对象赋值
    	Man(char *brother, char *s_name,int s_age) : Human(s_name, s_age){
    		this->brother = brother;
    		cout << "Man 构造函数" << endl;
    	}
    	~Man(){
    		cout << "Man 析构函数" << endl;
    	}
    	//泡妞
    	void chasing(){
    		cout << "泡妞" << endl;
    	}
    private:
    	//兄弟
    	char* brother;	
    };
    
    void func(){
    	//父类构造函数先调用
    	//子类的析构函数先调用
    	Man m1("danny", "jack", 18);
    }
    
    void main(){
    	func();
    
    	system("pause");
    }
    */
    
    
    //子类对象调用父类的成员
    /*
    class Human{
    public:
    	Human(char* name, int age){
    		this->name = name;
    		this->age = age;
    		cout << "Human 构造函数" << endl;
    	}
    	~Human(){
    		cout << "Human 析构函数" << endl;
    	}
    	void say(){
    		cout << "说话" << endl;
    	}
    public:
    	char* name;
    	int age;
    };
    
    //男人
    class Man : public Human{
    public:
    	//给父类构造函数传参，同时给属性对象赋值
    	Man(char *brother, char *s_name, int s_age) : Human(s_name, s_age){
    		this->brother = brother;
    		cout << "Man 构造函数" << endl;
    	}
    	~Man(){
    		cout << "Man 析构函数" << endl;
    	}
    	//泡妞
    	void chasing(){
    		cout << "泡妞" << endl;
    	}
    	void say(){
    		cout << "男人喜欢装逼" << endl;
    	}
    private:
    	//兄弟
    	char* brother;
    };
    
    void main(){
    	//是覆盖，并非动态
    	Man m1("alan","john",18);
    	m1.say();
    	m1.Human::say();
    
    	m1.Human::age = 10;
    
    	system("pause");
    }
    */