实验五

#ifndef MACHINEPETS_H
#define MACHINEPETS_H
#include <string>
using namespace std;
class machinepets{
public:
    machinepets(const string s);
    virtual string talk()=0;
    string getnickname();
private:    
    string nickname;

};
#endif

#ifndef PETDOGS_H
#define PETDOGS_H
#include "machinepets.h"
#include<string>
using namespace std;
class petdogs : public machinepets {
public:
    petdogs(const string s);
    string talk();

};

#endif

#ifndef PETCATS_H
#define PETCATS_H
#include "machinepets.h"
#include<string>
using namespace std;
class petcats : public machinepets {
public:
    petcats(const string s);
    string talk();

};

#endif

#include "machinepets.h"
#include <string>
#include <iostream>
using namespace std;
machinepets::machinepets(string s):nickname(s){}
string machinepets::getnickname(){
    return nickname;
}

#include "petcats.h"
#include <iostream>
using namespace std;
petcats::petcats(string s):machinepets(s){}
string petcats::talk(){
    return "miao wu~";
}

#ifndef PETDOGS_H
#define PETDOGS_H
#include "machinepets.h"
#include<string>
using namespace std;
class petdogs : public machinepets {
public:
    petdogs(const string s);
    string talk();

};

#endif

#include "petcats.h"
#include "petdogs.h"
#include "machinepets.h"
#include <iostream>
using namespace std;
void play(machinepets *p){
    cout<<p->getnickname()<<ends<<"says"<<ends<<p->talk()<<endl;

}
int main(){
    petcats cat("miku");
    petdogs dog("da hunag");

    play(&cat);
    play(&dog);

    system ("pause");
    return 0;
}

 

实验结论 ：

　　了解虚函数的使用和意义，编写子程序作为接口通过指针访问派生类的同名函数；