C++作业（第八章）8-5

8-5 定义一个哺乳动物Mammal类，再由此派生出狗Dog类，二者都定义

Speak()成员函数，基类中定义为虚函数，定义一个Dog类的对象，调用Speak函数，观察运行结果。

 

#include <iostream>

using namespace std;

class Mammal
{
public:
    Mammal(){}
    ~Mammal(){}
    virtual void Speak() const {cout<<"Mammal Sprak!"<<endl;}
};

class Dog : public Mammal
{
public:
    Dog(){}
    ~Dog(){}
    void Speak() const {cout<<"Wang!"<<endl;}
};

int main()
{
    Mammal *pDog = new Dog;
    pDog->Speak();
    return 0;
}