实验四

#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;
}

#ifndef BATTERY_H
#define BATTERY_H

class Battery{
    public:
        Battery(int b=70);
        int getbatterySize();
        int batterySize;
};

#endif 

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

class Car{
    
    public:
        Car(string x,string y,int z,int h=0):maker(x),model(y),year(z),odometer(h){}
        friend ostream& operator<<(ostream &out, const Car &c);
        void updateOdometer(int a);    
        string maker,model;
        int year,odometer;

};

#endif

#ifndef ELECTRICCAR_H
#define ELECTRICCAR_H
#include"battery.h"
#include"car.h"
#include<iostream>
#include<string>

class ElectricCar:public Car,public Battery{
    public:
        ElectricCar(string x,string y,int z,int h=0,int n=70):Car(x,y,z,h),Battery(n){}
        friend ostream& operator<<(ostream &outCar, const ElectricCar &e);
        void updateOdometer(int a);
};

#endif

#include"battery.h"

Battery::Battery(int b){
    batterySize=b;
}

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

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

ostream& operator<<(ostream &out, const Car &c){
    out << "maker:" << c.maker << endl ;
    out << "model:" << c.model << endl ;
    out << "year:" << c.year << endl ;
    out << "odometer:" << c.odometer << endl;
    return out;
}

void Car::updateOdometer(int a){
    if(a<odometer) 
        cout<<"warning:wrong number"<<endl;
    odometer=a;
}

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

ostream& operator<<(ostream &out, const ElectricCar &e) {
    out << "maker:" << e.maker << endl; 
    out << "model:" << e.model << endl;
    out << "year:" << e.year << endl;
    out << "odometer:" << e.odometer << endl; 
    out << "batterySize:" << e.batterySize << "-kWh" << endl;
    return out;
}

void ElectricCar::updateOdometer(int a) {
    if(a<odometer) 
        cout<<"Warning!"<<endl;
    else 
            odometer=a;
}

 

#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();
        // 补足:将运算符[]重载为成员函数的声明
        // ×××
        int & operator[](int m);
        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) {
        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;
}

// 补足:将运算符[]重载为成员函数的实现
// ×××

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

通过翻书查找大体可以做出来，但是在函数的实现里部分细节还是不太理解，包括引用到的函数头文件和派生类的运用还不够熟。

 

https://www.cnblogs.com/knight04/p/10853219.html
https://www.cnblogs.com/yfwg/p/10886264.html
https://www.cnblogs.com/99563220-fhy/p/10902912.html