C++ 引用传递的学习

C++ 引用与引用作为函数的参数
C++函数的三种传递方式为：值传递、指针传递和引用传递

C++ 上课习题

#include <iostream> 
using namespace std; 
class Zombie
{
    private:
    int _strength;
    public:
    Zombie(int strength) 
    {
        _strength = strength; 
    }
    int getStrength() 
    {
        return _strength; 
    }
    void setStrength(int newStrength) 
    {
        _strength += newStrength; 
    }
};
class Human
{ 
    private:
    int _blood; 
    public:
    Human(int blood) 
    {
        _blood = blood; 
    }
    void attackbyZombie(Zombie &zombie) //pass by ref 
    {
        _blood -= zombie.getStrength();
        zombie.setStrength(zombie.getStrength()); 
    }
    int getblood() 
    {
        return _blood; 
    }
};
int main() {
    Zombie* zombie = new Zombie(5); 
    Human* human = new Human(20); 
    cout << zombie->getStrength()<<endl; 
    human->attackbyZombie(*zombie); 
    cout << zombie->getStrength() <<endl;
    delete(zombie); 
    delete(human);
    return 0; 
}

刘月林
2019/03/20
写于浙江宁波