继承和多态

全局变量，int monster= 10000:定义英雄类hero，受保护的属性string name，int hp,int attck;公有的无参构造，有参构造，虚成员函数 void Ak(blood-=0)，法师类继承自英雄类，私有属性 int p_atk=50;重写虚成员函数void Ak(blood-=(attck+p_atk);射手类继承自英雄类，私有属性 int c_atk = 100;重写成员函数void Ak(blood-=(attck+c_atk);实例化类对象，判断怪物何时被杀死

#include 

using namespace std;
int monster=10000;
class hero
{
protected:
    string name;
    int hp;
    int attck=100;
public:
    hero(){}
    hero(string a,int b,int c):name(a),hp(b),attck(c){}
    virtual void atk(int &blood)
    { blood -= 0;}
};
class fs:public hero
{
    int ap_atk=50;
public:
    fs(){}
    fs(string a,int b,int c):hero(a,b,c){}
    void atk(int &blood)
    {
        blood-=(attck+ap_atk);
    }
};
class ss:public hero
{
    int ad_atk=100;
public:
    ss(){}
    ss(string a,int b,int c):hero(a,b,c){}
    void atk(int &blood)
    {
        blood-=(attck+ad_atk);
    }
};
int main()
{
    fs f("奥特之母",1200,50);
    ss s("奥特之父",1000,100);
    int a=0;
    while(monster>0)
    {
       a++;
       cout<<"monster="<