第4题

#include <iostream>using namespace std;class Student{public:                               void get_value();  void display( ); protected :                            int num;    char name[10];    char sex;};void Student::get_value() {cin>>num>>name>>sex;}void Student::display( ) {cout<<"num: "<<num<<endl;  cout<<"name: "<<name<<endl;  cout<<"sex: "<<sex<<endl; }class Student1: public Student              {public:   void get_value_1();   void display1( ); private:   int age;                             char addr[30];};void Student1::get_value_1() {get_value();  cin>>age>>addr; }void Student1::display1( )  {cout<<"num: "<<num<<endl;        cout<<"name: "<<name<<endl;          cout<<"sex: "<<sex<<endl;            cout<<"age: "<<age<<endl;            cout<<"address: "<<addr<<endl;      }int main( ) {Student1 stud1;                        stud1.get_value_1();                  stud1.display1( );                     return 0; }