P198 4

<img src="https://img-blog.youkuaiyun.com/20150518130531631?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvWXVTb25nNDg2OQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />#include <iostream> 
using namespace std; 
class Student//声明基类
{public:     //基类公用成员
void get_value(); 
void display( );  
protected : //基类保护成员
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 //声明一个公用派生类
{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; //引用基类的保护成员，合法
cout<<"name: "<<name<<endl; //引用基类的保护成员，合法
cout<<"sex: "<<sex<<endl; //引用基类的保护成员，合法
cout<<"age: "<<age<<endl; //引用派生类的私有成员，合法
cout<<"address: "<<addr<<endl; //引用派生类的私有成员，合法
} 
int main( )  
{Student1 stud1; //stud1是派生类student1类的对象
stud1.get_value_1(); //调用派生类对象stud1的公用成员函数get_value_1; 
stud1.display1( ); //调用派生类对象stud1的公用成员函数display1 
return 0; 
}