5.4

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#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;}

5.3是保护继承方式，它和公共继承有很多公共点，但是原本公有的成员在公有派生中是公有的，但在保护继承下是受保护的，能被派生类的成员函数调用

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