#include <iostream>
#include<string>
using namespace std;
class Student//聲明基類
{
public://公用部分
  Student(int n, string nam)//基類構(gòu)造函數(shù)
  {
   num=n;
   name=nam;
  }
  void display( )//輸出基類數(shù)據(jù)成員
  {
   cout<<"num:"<<num<<endl;
   cout<<"name:"<<name<<endl;
  }
protected://保護部分
  int num;//基類有兩個數(shù)據(jù)成員
  string name;
};
class Student1: public Student//聲明公用派生類Student1
{
public:
  Student1(int n,char nam[10],int a):Student(n,nam)//派生類構(gòu)造函數(shù)
  {age=a;}//在此處只對派生類新增的數(shù)據(jù)成員初始化
  void show( ) //輸出num，name和age
  {
   display( ); //輸出num和name
   cout<<"age: "<<age<<endl;
  }
private://派生類的私有數(shù)據(jù)
  int age; //增加一個數(shù)據(jù)成員
};
class Student2:public Student1 //聲明間接公用派生類Student2
{
public://下面是間接派生類構(gòu)造函數(shù)
  Student2(int n, string nam,int a,int s):Student1(n,nam,a) {score=s;}
  void show_all( ) //輸出全部數(shù)據(jù)成員
  {
   show( ); //輸出num和name
   cout<<"score:"<<score<<endl; //輸出age
  }
private:
  int score; //增加一個數(shù)據(jù)成員
};
int main( )
{
  Student2 stud(10010,"Li",17,89);
  stud.show_all( ); //輸出學(xué)生的全部數(shù)據(jù)
  return 0;
}

num:10010
name:Li
age:17
score:89

  Student(int n, string nam)

  Student1(int n, string nam],int a):Student(n,nam)

  Student2(int n, string nam,int a,int s):Student1(n,nam,a)

  Student2(int n, string nam,int a,int s):Student1(n,nam),student1(n, nam, a)

class A //基類
{
public:
  int i;
protected:
  void f2( );
  int j;
private:
  int k;
};
class B: public A //public方式
{
public:
  void f3( );
protected:
  void f4( );
private:
  int m;
};
class C: protected B //protected方式
{
public:
  void f5( );
private:
  int n;
};