#include <iostream>
using namespace std;
class A{
public:
     virtual ~A(){ cout<<"call A::~A()"<<endl; }
};
class B:public A{
    char *buf;
public:
    B(int i){buf=new char[i];}
     ~B(){
        delete [] buf;
        cout<<"call B::~()"<<endl;
}
};
int main(){
    A* a=new B(10);
    delete a;
    system("pause");
    return 0;
}