C++一些构造，老是忘记

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// work05_01.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>
using namespace std;
//（重点掌握）给出学生类的声明如下：
class Student
{
public:
    enum Gender { Male, Female }; //枚举类型，性别
    //声明友元函数，用于将枚举类型输出文本形式  
    friend std::ostream& operator<<(std::ostream& os, Gender gender);//友元函数要在class外定义
    Student()                                                           //无参数构造函数  
    {
        name_ = NULL;
        gender_ = Male;
    }
    Student(const char* name, Gender gender) //带参数构造函数  
    {
        name_ = new char[strlen(name)+1];
        strcpy_s(name_,strlen(name)+1,name);
        gender_ = gender;
    }
    Student(const Student& student) //拷贝构造函数  
    {
        name_ = new char[strlen(student.name_)+1];
        strcpy_s(name_, strlen(student.name_)+1,student.name_);

    }
    Student& operator= (const Student& student)                                 //赋值运算符  
    {
        if (this == &student)
        {
            return *this;
        }
        delete[] name_;
        name_ = new char[strlen(student.name_) + 1];
        strcpy_s(name_, strlen(student.name_) + 1, student.name_);
    }

    ~Student()                                                                  //析构函数，释放内存 
    {
        if (name_ != NULL) {
            delete[] name_;
        }
    }
    void Show() const                                                            //常成员函数用于显示学生姓名和性别  
    {
        std::cout << "名字:" << name_ << "\n性别:" << gender_ << "\n\n";
    }
    
private:
    char* name_;    //名字  
    Gender gender_; //性别  
};

std::ostream& operator<<(std::ostream& os, Student::Gender gender)
{
    if (gender == Student::Female)
    {
        os << "Female";
    }
    else {
        os << "Male";
    }
    return os;
}

//完成学生类的实现，并利用下面给出的main函数测试所有的成员函数。(可以尝试在常成员函数中修改成员数据，观察编译器是否报错)。
int main()
{
    Student s1;
    Student s2("Nicolas ZhaoSi", Student::Gender::Male);
    Student s3("Jason GuoDa Statham", Student::Gender::Male);
    Student s4(s2);
    s1 = s3;
    s1.Show();
    s2.Show();
    s3.Show();
    s4.Show();

}