C++ 多态的游戏例程

1）头文件 game.h

#ifndef GAME_H
#define GAME_H

// base class
class CCreature {
protected:
    int m_nLifePower, m_nPower;

public:
    virtual void Attack(CCreature *pCreature){}
    virtual void Hurted(int nPower){}
    virtual void FightBack(CCreature *pCreature){}
    virtual int IsDead(){}
};

class CDragon: public CCreature {
public:
    CDragon();
    virtual void Attack(CCreature *pCreature);
    virtual void Hurted(int nPower);
    virtual void FightBack(CCreature *pCreature);
    virtual int IsDead();
};

class CWolf: public CCreature {
public:
    CWolf();
    virtual void Attack(CCreature *pCreature);
    virtual void Hurted(int nPower);
    virtual void FightBack(CCreature *pCreature);
    virtual int IsDead();
};

#endif // GAME_H

 

2）成员函数实现文件game.cpp

#include <iostream>
#include "game.h"

using namespace std;

// === Dragon
CDragon::CDragon()
{
    this->m_nLifePower = 100; // life value
    this->m_nPower = 50; // attack ability
}
void CDragon::Attack(CCreature *p)
{
    // attack code place here
    cout << "Dragon fire" << endl;

    p->Hurted(m_nPower);
    if (!p->IsDead())
        p->FightBack(this);
}

void CDragon::Hurted(int nPower)
{
    // hurt action place here
    cout << "Dragon hurt " << nPower << endl;

    m_nLifePower -= nPower;
    if (m_nLifePower <= 0)
        cout << "Dragon was killed" << endl;
}

void CDragon::FightBack(CCreature *p)
{
    // fight back action place here.
    cout << "Dragon fire back! " << endl;

    p->Hurted(m_nPower/2);
}

int CDragon::IsDead()
{
    if (m_nLifePower <= 0)
        return 1;
    return 0;
}

// === Wolf
CWolf::CWolf()
{
    this->m_nLifePower = 80; // life value
    this->m_nPower = 30; // attack ability
}
void CWolf::Attack(CCreature *p)
{
    // attack code place here
    cout << "CWolf palm" << endl;

    p->Hurted(m_nPower);
    if (!p->IsDead())
        p->FightBack(this);
}

void CWolf::Hurted(int nPower)
{
    // hurt action place here
    cout << "CWolf hurt " << nPower << endl;

    m_nLifePower -= nPower;
    if (m_nLifePower <= 0)
        cout << "CWolf was killed" << endl;
}

void CWolf::FightBack(CCreature *p)
{
    // fight back action place here.
    cout << "CWolf palm back! " << endl;

    p->Hurted(m_nPower/2);
}

int CWolf::IsDead()
{
    if (m_nLifePower <= 0)
        return 1;
    return 0;
}

3）主程序文件 main.cpp

#include <iostream>
#include <string.h>

#include "game.h"

using namespace std;

int main()
{
    CDragon dragon;
    CWolf wolf;

    while (1) {
        for (int i = 0; i < 60000; i++);
        
        dragon.Attack(&wolf);
        if (wolf.IsDead())
            break;
    }

    return 0;
}

 

4）运行结果