#include <iostream>

 /* run this program using the console pauser or add your own getch, system("pause") or input loop */

 using namespace std;

 //定义最低层基类，它作为其他类的基类

 class First {

     int val1;

 public:

     First(void) {

         cout<<"The First initialized"<<endl;

     }

 };

 //定义派生类，它作为其他类的基类

 class Second :public First {

     int val2;

 public:

     Second(void) {

         cout<<"The Second initialized"<<endl;

     }

 };

 //定义最上层派生类

 class Three :public Second {

     int val3;

 public:

     Three() {

         cout<<"The Three initialized"<<endl;

     }

 };

 //定义各基类的对象，测试构造函数的执行情况

 //定义各基类的对象，测试构造函数的执行情况

 int main(int argc, char** argv) {

         cout<<"First f1;"<<endl;

     First f1;

     cout<<"Second s1;"<<endl;

     Second s1;

     cout<<"Three t1;"<<endl;

     Three t1;

     return ;

 }