C++友元函数访问类的私有成员

工程中我们经常需要访问一些类的成员，添加一个友元函数可以达到我们的目的。

#include <iostream>
#include<cstring>
using namespace std ;

class Student{
    private:
    string  name;   int age;    int sore;
    public:
    Student(string name,int age,int sore)
    {
        this->name = name;
        this->age = age;
        this->sore = sore;
    }   
    friend void Display(Student student);

} ; 

void Display(Student student)
{
    cout<<student.name<<"\t"<<student.age<<"\t"<<student.sore<<endl;

}

int main(void)
{
    Student a("TOM",13,96);

    Display(a);

    return 0;
}