c++复习：多态

#include<iostream>
#include<vector>
#include<string>
#include<stdlib.h>
#include<set>
#include<map>
using namespace std;
#define MAX 999999

class takebus
{
    public:
        void takebus_to_subway()
        {
            cout<<"to sbway:take 438"<<endl;
        }
        void takebus_to_station()
        {
            cout<<"to_station:take K1"<<endl;
        }
};
class BUS
{
    public:
        virtual void Takebus_to_somewhere(takebus &tb)=0;
};
class subway:public BUS
{
    public:
        virtual void Takebus_to_somewhere(takebus & tb)
        {
            tb.takebus_to_subway();
        }
};
class station:public BUS
{
    public:
        virtual void Takebus_to_somewhere(takebus & tb)
        {
            tb.takebus_to_station();
        }
};
int main()
{
    takebus tb;
    BUS *b=NULL;
    b=new subway;
    //b=new station;
    b->Takebus_to_somewhere(tb);
    delete b;
    return 0;
}