public 继承

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class student
{
  public:
    student( ) { name = "tang"; num = "104080219"; sex = "M"; }
    void display( );
    void input( );
  private:
    string name;
    string num;
    string sex;
};

class student1: public student
{
  public:
     student1( ): student( ) { add = "HuNanyongzhou"; school = "HUT"; } // 派生类的构造函数
     void display2( );
     void input2( );
  private:
     string add;
     string school;
};

void student1::display2( )
{
  display( );
  cout<<"地址:"<<add<<endl;
  cout<<"学校:"<<school<<endl;

}
void student1::input2( )
{
  input( );
  cout<<"请输入地址:"<<endl;
  cin>>add;
  cout<<"请输入学校:"<<endl;
  cin>>school;
}

void student::display( )
{
  cout<<"该生信息如下:"<<endl;
  cout<<"名字:"<<name<<endl;
  cout<<"学号:"<<num<<endl;
  cout<<"性别:"<<sex<<endl;
}

void student::input( )
{
  cout<<"请输入名字:"<<endl;
  cin>>name;
  cout<<"请输入学号:"<<endl;
  cin>>num;
  cout<<"请输入性别:"<<endl;
  cin>>sex;
}

int main(  )
{
   student p;
   p.display( );
   p.input( );
   p.display( );
   cout<<endl;
   student1 q;
   q.display2( );
   cout<<endl;
   q.input2( );
   q.display2( );
   system("pause");
   return 0;
}