c++实验4

project1：

#ifndef BATTERY_H
#define BATTERY_H
class Battery {
public:
    Battery(int batterySize0 = 70);
    Battery(const Battery& b0);
    int getbattery();
private:
    int batterySize;
};
#endif // !BATTERY_H

#ifndef CAR_H
#define CAR_H
#include<iostream>
using namespace std;

class Car {
public:
    Car(string maker0, string model0, int year0, int odometer0=0);
    Car(const Car &car0);
    friend ostream&operator<<(ostream &out,const Car &car0);
    void updateOdometer(int odmt);

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

};
#endif // !CAR_H

#ifndef ELECTRICCAR_H
#define ELECTRICCAR_H
#include"car.h"
#include"battery.h"
class ElectricCar :public Car {
public:
    ElectricCar(string maker0, string model0, int year0,Battery battery0=70, int odometer0 = 0);
    friend ostream&operator<<(ostream &out, const ElectricCar &car0);
    Battery battery;
};


#endif // ELECTRICCAR_H

#include "battery.h"

Battery::Battery(int batterySize0):batterySize(batterySize0)
{
}

Battery::Battery(const Battery & b0):batterySize(b0.batterySize)
{
}

int Battery::getbattery()
{
    return batterySize;
}

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

Car::Car(string maker0, string model0, int year0, int odometer0):maker(maker0),model(model0),year(year0),odometer(odometer0)
{
}

Car::Car(const Car & car0): maker(car0.maker), model(car0.model), year(car0.year), odometer(car0.odometer)
{
}

void Car::updateOdometer(int odmt)
{
    odometer = odmt;
}

ostream & operator<<(ostream & out, const Car & car0)
{
    out << "maker:" << car0.maker << endl << "model:" << car0.model << endl << "year:" << car0.year << endl << "odometer:" << car0.odometer;
    return out;
    // TODO: 在此处插入 return 语句
}

#include "electricCar.h"
using namespace std;
#include<iostream>
ElectricCar::ElectricCar(string maker0, string model0, int year0, Battery battery0, int odometer0):Car(maker0,model0,year0,odometer0),battery(battery0)
{
}

ostream & operator<<(ostream & out, const ElectricCar & car0)
{
    Car car1(car0);
    Battery b1(car0.battery);
    int s = b1.getbattery();
    out << car1 << endl;
    out <<"Battery:"<< s;
    return out;

}

#include <iostream>
using namespace std;

#include "car.h"
#include "electricCar.h" 

int main() {
    // 测试Car类 
    Car oldcar("Audi", "a4", 2016);
    cout << "--------oldcar's info--------" << endl;
    oldcar.updateOdometer(25000);
    cout << oldcar << endl;

    // 测试ElectricCar类 
    ElectricCar newcar("Tesla", "model s", 2016);
    newcar.updateOdometer(2500);
    cout << "\n--------newcar's info--------\n";
    cout << newcar << endl;

    system("pause");

    return 0;
}

project2:

#ifndef ARRAY_INT_H
#define ARRAY_INT_H

class ArrayInt{
    public:
        ArrayInt(int n, int value=0);
        ~ArrayInt();
        int &operator[](int n);
        // 补足:将运算符[]重载为成员函数的声明
        // ×××
        void print(); 
    private:
        int *p;
        int size;
};

#endif

#include "arrayInt.h"
#include <iostream>
#include <cstdlib>
using std::cout;
using std::endl;

ArrayInt::ArrayInt(int n, int value): size(n) {
    p = new int[size];
    
    if (p == nullptr) {
        cout << "fail to mallocate memory" << endl;
        exit(0); 
    } 
    
    for(int i=0; i<size; i++)
        p[i] = value;
}

ArrayInt::~ArrayInt() {
    delete[] p;
}

int &ArrayInt::operator[](int n)
{
    return p[n];
}

void ArrayInt::print() {
    for(int i=0; i<size; i++)
        cout << p[i] << " ";
    cout << endl;
}

// 补足:将运算符[]重载为成员函数的实现
// ×××

#include <iostream>
using namespace std;

#include "arrayInt.h"

int main() {
    // 定义动态整型数组对象a，包含2个元素，初始值为0
    ArrayInt a(2);
    a.print();
    
    // 定义动态整型数组对象b，包含3个元素，初始值为6
    ArrayInt b(3, 6);
    b.print();

    // 通过对象名和下标方式访问并修改对象元素
    b[0] = 2;
    cout << b[0] << endl;
    b.print();

    system("pause");

    return 0;
}