子类无权访问父类的私有数据成员

// 111.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include<iostream>class person {int age;public:void SetAge(int nAge){age = nAge;}int GetAge(){return age;}};class student : public  person{public:void display(){using namespace std;cout<<person::GetAge();}void SetAge(int nAge){//age = nAge;   //error}};int main(int argc, char* argv[]){student stu;stu.person::SetAge(25);stu.display();return 0;}