C++ 友元 ，常量，静态成员

//头文件
#ifndef STUDENT_H
#define STUDENT_H

class Student
{
public:
    friend void Print_Student();  //友元声明
    Student(const int m_student_id,const char* m_student_name);//带参构造
    Student(const Student& other); //拷贝构造
private:
    void printStudentInfo();//输出学生信息
    void SetStudentName(const char* m_student_name); //设置学生姓名
    static int School_Id; //定义学校id
    const int StudentId;   //定义学生id
    char* StudentName;//定义学生名称
};
int Student::School_Id = 1; //类中的静态成员需要在类外初始化

void Print_Student(); 


#endif

//cpp文件

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include "Student.h"
using namespace std;
//带参构造
Student::Student(int m_student_id, const char* m_student_name) :StudentId(m_student_id)
{
    this->StudentName = new char[strlen(m_student_name) + 1];
    strcpy(this->StudentName, m_student_name);
}
//拷贝构造
Student::Student(const Student& other) :StudentId(other.StudentId)
{
    this->StudentName = new char[strlen(other.StudentName) + 1];
    strcpy(this->StudentName, other.StudentName);
}
//打印学生信息
void Student::printStudentInfo()
{
    cout << "学校id：" <<School_Id<< "\t学生学号id："<<StudentId << "\t学生姓名："<<StudentName << endl;
}
//设置学生姓名
void Student::SetStudentName(const char* m_student_name)
{
    strcpy(this->StudentName, m_student_name);
}
void Print_Student()
{
    Student temp1(1, "小明");    
    temp1.printStudentInfo();   //打印学生1的信息
    temp1.SetStudentName("小刚");

    Student temp2(temp1);
    temp2.printStudentInfo();//打印学生2的信息
}

int main()
{
    Print_Student();
    return 0;
}