ext_struct_func.cpp

#include<iostream>
#include<stdio.h>
using namespace std;
struct Base { 
 int v1;
// private: //error!
 int v3;
 public: //显示声明public
 int v2;
 virtual void print(){ 
 printf("%s\n","Base");
 }; 
 Base(){cout<<"Base construct"<<endl;};
 virtual ~Base(){cout<<"Base deconstruct"<<endl;};
};

struct Derived:Base { 

 Derived(){cout<<"Derived construct"<<endl;};
 virtual ~Derived(){cout<<"Derived deconstruct"<<endl;};
 public:
 int v2;
 void print(){ 
 printf("%s\n","Derived");
 }; 
};

int main() {
 Base *b=new Derived();
 b->print();
 delete b;
 return 0;
}