实验三

Car.hpp

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

class Car {
public:
    Car(string _maker, string _model, int _year, double _oddmeters = 0 );
    Car(Car& c);
    void info();
    void update_oddmeters(double newoddmeters);
private:
    string maker, model;
    int year;
    double oddmeters;
};

Car::Car(string _maker, string _model, int _year, double _oddmeters ) {
    maker = _maker;
    model = _model;
    year = _year;
    oddmeters = _oddmeters;
}
Car::Car(Car& c) {
    maker = c.maker;
    model = c.model;
    year = c.year;
    oddmeters = c.oddmeters;
}

void Car::info() {
    cout << setiosflags(ios::left);
    cout << setw(15) << "maker:" << maker << endl;
    cout << setw(15) << "model:" << model << endl;
    cout << setw(15) << "year:"  << year << endl;
    cout << setw(15) << "oddmeters:" << oddmeters << endl;
}
void Car::update_oddmeters(double newoddmeters) {
    if (newoddmeters < oddmeters) {
        cout << "error" << endl;
    }
    else {
        oddmeters = newoddmeters;
    }
}

ElectricCar.hpp

#pragma once
#include"Car.hpp"
#include"Battery.hpp"

class ElectricCar :public Car {
public:
    ElectricCar(string _maker,string _model,int _year,double _oddmeters = 0, int _capacity = 70);
    void info();
private:
    Battery battery;
};

ElectricCar::ElectricCar(string _maker, string _model, int _year, double _oddmeters, int _capacity) : Car(_maker, _model, _year, _oddmeters), battery(_capacity) {

}

void ElectricCar::info() {
    Car::info();
    cout << setw(15) << "capacity:" << battery.get_capacity() << "-kwh" << endl;
}

Battery.hpp

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

class Battery {
public:
    Battery(int _capacity = 70);
    Battery(Battery& b);
    int get_capacity() { return capacity; }
private:
    int capacity;
};

Battery::Battery(int _capacity) :capacity{ _capacity } {

}

Battery::Battery(Battery& b) {
    capacity = b.capacity;
}

task3.cpp

#include"ElectricCar.hpp"

int main()
{
    //test class of Car
    Car oldcar("Audi", "a4", 2016);
    cout << "---------oldercar's info---------" << endl;
    oldcar.update_oddmeters(25000);
    oldcar.info();

    cout << endl;

    //test class of ElectricCar
    ElectricCar newcar("Tesla", "model s", 2016);
    newcar.update_oddmeters(25000);
    cout << "\n---------newcar's info--------\n";
    newcar.info();

}

 

 

 

task4

pets.hpp

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

class MachinePets {
private:
    string nickname;
public:
    MachinePets(const string _nickname):nickname(_nickname){}
    MachinePets(const MachinePets& m) { nickname = m.nickname; }
    virtual string talk() { return " "; }
    string get_nickname() { return nickname; }
};


class PetCats:public MachinePets {
public:
    PetCats(const string s):MachinePets(s){}
    string talk();
};
string PetCats::talk() {
    return "mioa wu~";
}


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

task4.hpp

#include"pets.hpp"

void play(MachinePets* ptr) {
    cout << ptr->get_nickname() << " says " << ptr->talk() << endl;
}

int main()
{
    PetCats cat("miku");
    PetDogs dog("da huang");

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