一道关于继承和多态的题目

#include<iostream> #include <complex> using namespace std; //---------------------------------------------- class Base//基类 { public: virtual void f(int); virtual void f(double); virtual void g(int i=10); }; void Base::f(int) { cout<<"Base::f(int)"<<endl; } void Base::f(double) { cout<<"Base::f(double)"<<endl; } void Base::g(int i) { cout<<i<<endl; } //------------------------------------------------ class Dervived:public Base { public: void f(complex<double>); void g(int i=20); }; void Dervived::f(complex<double>) { cout<<"Dervived::f(complex<double>)"<<endl; } void Dervived::g(int i) { cout<<i<<endl; } //---------------------------------------------- void main() { Base b; Dervived d; Base *pb=new Dervived; b.f(1.0);//基类对象调用，执行基类的函数 d.f(1.0);//子类对象调用，执行子类的函数 pb->f(1.0);//基类的指针，指向子类，调用函数时，执行基类的函数 b.g();//基类对象调用，执行子类的函数 d.g();//子类对象调用，执行子类的函数 pb->g();//基类的指针，指向子类，调用函数时，执行基类的函数 delete pb; }