#include <iostream> 
 #include <string> 
 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; 
 	string name; 
 	char sex; 
 }; 
 class Student1:public Student 
 { 
 public: 
 	void display_1(int &age,string &addr) 
 	{ 
 		cout < <" age:" < <age < <endl; 
 		cout < <"address:" < <addr < <endl; 
 	} 
 	int age; 
 	string addr; 
 }; 
 int main() 
 { 
 	Student1 stud; 
 	stud.get_value(); 
 	stud.display(); 
 	stud.display_1(10,"haha"); 
 	return 0; 
 }   
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