5.2

#include <iostream>
using namespace std;
class Student
{
public:
   void get_value()
   {
       cin>>num>>name>>sex;
   }
   void display( )
   {
       cout<<"num: "<<num<<endl;
       cout<<"name: "<<name<<endl;
       cout<<"sex: "<<sex<<endl;
   }
private :
   int num;
   char name[10];
   char sex;
};   

class Student1: private Student
{
public:
   void get_value_1()
   {
       get_value();
       cin>>age>>addr;
   }
   void display_1()
   {
       display();
       cout<<"age: "<<age<<endl;      
       cout<<"address: "<<addr<<endl;
   } 
private:
       int age;
       char addr[30];
 };

int main()
{
    Student1 stud1;
    stud1.get_value_1();          //这里在调用时就不能stud1.display（）   因为是私有继承的，只能通过派生类的成员韩式调用
    stud1.display_1();
    return 0;
}