#ifndef?PERSON_H
#define?PERSON_H

#include<string>
using?namespace?std;

class?Person
{
public:
?Person(string?name);
?virtual~Person();
?virtual?void?worker()?=?0;
protected:
?string?m_strName;
};
#endif

#include"Person.h"
#include<iostream>
using namespace std;

Person::Person(string name)
{
?m_strName = name;
?cout << "Person()" << endl;
}

Person::~Person()
{
?cout << "~Person()" << endl;
}

#ifndef WORKER_H
#define WORKER_H

#include"Person.h"

class Worker:public Person
{
public:
?Worker(string name,int age);
?virtual~Worker();
?virtual void work();
protected:
?int m_iAge;

};
#endif

#include"Worker.h"
#include<iostream>
using namespace std;

Worker::Worker(string name, int age):Person(name)
{

?m_iAge = age;
?cout << "Worker()" << endl;
}

Worker::~Worker()
{
?cout << "~Worker()" << endl;
}

void Worker::work()
{
?cout << "work()" << endl;
}

#ifndef DUSTMAN_H
#define DUSTMAN_H

#include"Worker.h"

class Dustman:public Worker
{
public:
?Dustman(string name, int age);
?virtual~Dustman();
?virtual void work();

};
#endif

#include"Dustman.h"
#include<iostream>
using namespace std;

Dustman::Dustman(string name, int age):Worker(name,age)
{

?cout << "Dustman()" << endl;
}
Dustman::~Dustman()
{
?cout << "~Dustman()" << endl;
}
void Dustman::work()
{
?cout << "work()" << endl;
}

#include"Dustman.h"
#include"Worker.h"
#include<iostream>
using namespace std;

int main()
{
?Worker worker("zhang", 15);
?return 0;
}

嚴重性?代碼?說明?項目?文件?行?禁止顯示狀態
錯誤?C2259?“Worker”: 不能實例化抽象類?dustman?d:\visual studio 2015\projects\dustman\dustman\demo.cpp?8?

嚴重性?代碼?說明?項目?文件?行?禁止顯示狀態
錯誤(活動)??不允許使用抽象類類型 "Worker" 的對象:?dustman?d:\Visual Studio 2015\Projects\dustman\dustman\demo.cpp?8?