C++错误修改

#include "stdafx.h"#include<iostream>using namespace std;class X1{protected: int x;public: X1(int xx){x=xx;} void output() { cout<<"x="<<x;}};class Y1:private X1{ int y;public: Y1(int xx=0,int yy=0):X1(xx) {y=yy;} virtual void output() { cout<<"x="<<x<<",y="<<y<<endl;}};class Z1:protected X1{ int z;public: Z1(int xx=0,int zz=0):X1(xx) {z=zz;} virtual void output() { cout<<"x="<<x<<",z="<<z<<endl;}};void main(){ X1 a(2);Y1 b(3,4);Z1 c(5,6);X1* p[3]={&a,&b,&c};for(int i=0;i<3;i++) { p[i]->output();}} 收起