在一些工程中我们经常需要访问某些类的静态成员，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;
}