C++ 类的继承

# include <iostream>using namespace std;class Base{public:Base(int x=0) :a(1){}virtual void show(){cout<<"Base cout"<<endl;}private:int a;};class Derive : public Base{public:Derive(int y=0) :b(3){}void show(){cout<<"Derive cout"<<endl;}private:int b;};int main(){ Base *m; Derive *n; m = new Derive; n = new Derive; m->show(); n->show(); cout<<sizeof(Base)<<endl; cout<<sizeof(Derive)<<endl;return 0;}