#include <iostream>
#include <string>
using namespace std;
class Student
{
public:
   Student(int n, string nam )
   {
      num=n;
      name=nam;
   }
   void display( )
   {
      cout<<"num:"<<num<<endl<<"name:"<<name;
   }
protected:
   int num;
   string name;
};
class Student1: public Student
{
public:
   Student1(int n1, string nam1,int a):Student(n1,nam1)
   {
      age=a;
   }
   void show( )
   {
      cout<<"This student is:"<<endl;
      display();
      cout<<"age: "<<age<<endl;
   }
private:
   Student monitor;
   int age;
};
int main( )
{
   Student1 stud1(20120107, "Johnson", 20);
   stud1.show( );
   return 0;
}

你说 monitor 怎么构造？

最终也不输出 monitor，题目最后只给了一个学号，一个名字，一个年龄然后把这三个输出。但是却要建立一个monitor，所以我也很奇怪这个怎么弄。。。

您能写一下这块的代码吗？我这个基础不是太扎实

把题目提出来看看
从monitor这个词上看，不应该是student

猜monitor不是student的实例，是个子类

6楼说的是，这个montior是个子类，要和age一起成为student1的私有成员

#include <iostream>
#include <string>
using namespace std;
class Student
{
public:
   Student(int n, string nam )
   {
      num=n;
      name=nam;
   }
   void display( )
   {
      cout<<"num:"<<num<<endl<<"name:"<<name<<endl;
   }
protected:
   int num;
   string name;
};
class Student1: public Student
{
public:
   Student1(int n1, string nam1,int a):Student(n1,nam1)
   {
      age=a;
   }
   void show( )
   {
      cout<<"This student is:"<<endl;
      display();
      cout<<"age: "<<age<<endl;
   }
private:
   int age;
};
int main( )
{
   Student1 stud1(20120107, "Johnson", 20);
   stud1.show( );
   return 0;
}