c++实验四

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

class Car{
public:
    Car(string maker0,string model0,int year0,int odometer0=0);
    friend ostream & operator<< (ostream &out,const Car &c);
    int updateOdometer(int newodometer);
    string getmaker(){return maker;}
    string getmodel(){return model;}
    int getyear(){return year;}
    int getodometer(){return odometer;}
private:
    string maker;
    string model;
    int  year;
    int  odometer;
};

#endif

#include "battery.h"

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

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

#ifndef ELECTRICAR_H
#define ELECTRICAR_H
#include "battery.h"
#include "car.h"
#include <string>
#include <iostream>
using namespace std;
class Battery;


class ElectricCar:public Car{
public:
    ElectricCar(string maker0,string model0,int year0,int odometer0=0,int battery0=70);
    friend ostream & operator<< (ostream &out,ElectricCar &c1);
    friend class Battery;
private:
    Battery b;
    int batterysize;
};

#endif

#include "electricCar.h"
using namespace std;

ElectricCar::ElectricCar(string maker0,string model0,int year0,int odometer0,int battery0):Car(maker0,model0,year0,odometer0){
    b.batterySize=battery0;
    batterysize=b.getbatterySize();
}

ostream & operator<< (ostream &out,ElectricCar &c1){
    out<<"maker:"<<c1.getmaker()<<endl;
    out<<"model:"<<c1.getmodel()<<endl;
    out<<"year:"<<c1.getyear()<<endl;
    out<<"odometer:"<<c1.getodometer()<<endl;
    out<<"batterySize:"<<c1.batterysize<<"-kWh"<<endl;
    return out;
}

#include <iostream>
using namespace std;

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

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

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

    system("pause");
    
    return 0;
}

#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;
}

#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 == 0) {
        cout << "fail to mallocate memory" << endl;
        exit(0); 
    } 
    
    for(int i=0; i<size; i++)
        p[i] = value;
}

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

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

int &ArrayInt::operator[](int n){
    
    return p[n];
    
}// 补足:将运算符[]重载为成员函数的实现