C++多态虚函数demo(三十三)

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1.代码示例  

#include<iostream>
#include<algorithm>
using namespace std;class Base{
public:void Fun(int x){cout<<"Base::Fun(int x)"<<endl;}void Fun(double x){cout<<"Base::Fun(double x)"<<endl;}//基类虚函数virtual void G(void){cout<<"Base::G(void)"<<endl;}
};class SubClass:public Base{
public:void Fun(int x){cout<<"SubClass::Fun(int x)"<<endl;}void Fun(double x){cout<<"SubClass::Fun(double x)"<<endl;}//覆盖基类虚函数virtual void G(void){cout<<"SubClass::G(void)"<<endl;}
};int main(){//SubClass *mm = new Base(); //错误//虚函数和纯虚函数的作用即多态,基类指针指向子类对象,当子类是G()重写(覆盖)了基类的虚函数,其实调用的是子类的G(),即多态精髓.Base *base = new SubClass();//基类指针指向子类对象//测试函数调用base->Fun(5);base->Fun(5.00);base->G();cout << "*********************" << endl;SubClass *cc = new SubClass();cc->Fun(5);cc->Fun(5.00);cc->G();cout << "*********************" << endl;Base *dd = new Base();dd->Fun(5);dd->Fun(5.00);dd->G();cout << "*********************" << endl;Base ee;ee.Fun(5);ee.Fun(5.00);ee.G();cout << "*********************" << endl;SubClass bb;bb.Fun(5);bb.Fun(5.00);bb.G();return 0;
}

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