实验4 继承

task3源代码

battery.hpp

#include<iostream>
using namespace std;

class Battery {

public:
    Battery(int a=70):capcity(a){}

    void get_capcity()
    {
        cout << capcity << endl;
    }
private:
    int capcity;
};

car.hpp

#pragma once
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class Car {
public:
    Car(string a,string b,int y):year(y),maker(a),model(b), odometers(0){}
    Car(){}
    void update_odometers(int a)
    {
        if (odometers < a)
            odometers = a;
        else cout << "input error" << endl;

    }

    void info() 
    {
        cout << "maker:"<<setw(10) << maker << endl;
        cout << "model:" << setw(10) << model << endl;
        cout << "year:" << setw(10) << year << endl;
        cout << "odometers:" << setw(10) << odometers << endl;
    }

private:
    int year;
    int odometers;
    string maker;
    string model;

};

electricCar.h

#pragma once
#include<iostream>
#include"car.h"
#include"battery.h"
#include<string>

class ElectricCar:public Car  {
public:
    ElectricCar(string a,string b,int y):Car(a,b,y)
    {}
private:
    Battery battery;
};

 

task4源代码

pets.hpp

#pragma once
#include<iostream>
#include<string>
using namespace std;

class MachinePets {
public:
    MachinePets(const string s):nickname(s){}

    virtual string talk() {
        return word;
    }

    string get_nickname() {
        return nickname;
    }
private:
    string nickname;
    string word=" ";
};

class PetCats : public MachinePets {
public:
    PetCats(const string s):MachinePets(s){}
    string talk(){
        return word;
    }
private:
    string word = "miao wu~";
};

class PetDogs : public MachinePets {
public:
    PetDogs(const string s) :MachinePets(s) {}
    string talk() {
        return word;
    }
private:
    string word = "wang wang~";
};

main.cpp

#include <iostream>
#include "pets.h"
void play(MachinePets* ptr)
{
    std::cout << ptr->get_nickname() << " says " << ptr->talk() <<
        std::endl;
}
int main()
{
    PetCats cat("miku");
    PetDogs dog("da huang");
    play(&cat);
    play(&dog);
}

运行截图：