实验四：类的继承，派生和多态（1）

佚名 6年前 (2019-05-14) 随笔 981人围观抢沙发百度已收录

【实验结论】

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#1.车辆基本信息管理

#ifndef BATTERY_H
#define BATTERY_H

class Battery
{
    public:
        Battery(int batterSize0=70);
        int getbatterysize();
        ~Battery();
    private:
        int batterySize;    
};

#endif

Battery.h

#include"Battery.h"

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

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

Battery::~Battery()
{}

Battery.cpp

#ifndef CAR_H
#define CAR_H
#include<iostream>
using std::string;
using std::ostream;
class Car
{
    public:
        Car(string maker0,string model0,int year0);
        friend ostream &operator<<(ostream &out,const Car &c);
        void updateOdometer(int updatemeter);
        string getmaker() const;
        string getmodel() const;
        int getyear() const;
        int getodometer() const;
        ~Car();
    private:
        string maker;
        string model;
        int year;
        int odometer;
};

#endif

Car.h

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

Car::Car(string maker0,string model0,int year0):maker(maker0),model(model0),year(year0)
{
    odometer=0;
}

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

void Car::updateOdometer(int updatemeter)
{
    if(updatemeter<odometer)
    {
        cout<<"Warning:Wrong!"<<endl;
    }
    else odometer=updatemeter;
}

string Car::getmaker() const
{
    return maker;
}

string Car::getmodel() const
{
    return model;
}

int Car::getyear() const
{
    return year;
}

int Car::getodometer() const
{
    return odometer;
}

Car::~Car()
{ }

Car.cpp

#ifndef ElectricCar_H
#define ElectricCar_H
#include<iostream>
#include"Car.h"
#include"Battery.h"
using std::string;
using std::ostream;

class ElectricCar:public Car
{
    public:
        ElectricCar(string maker0,string model0,int year0);
        friend ostream &operator<<(ostream &out,const ElectricCar &e);
        ~ElectricCar();
    private:
        Battery battery;
        int batterySize;
};

#endif

ElectricCar.h

#include<iostream>
#include"ElectricCar.h"
#include"Car.h"
#include"Battery.h"
using namespace std;

ElectricCar::ElectricCar(string maker0,string model0,int year0):Car(maker0,model0,year0)
{
    batterySize=battery.getbatterysize();
}

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

ElectricCar::~ElectricCar()
{ }

ElectricCar.cpp

#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;
}

main.cpp

[运行结果]

#2.重载运算符[ ]

#ifndef ARRAY_INT_H
#define ARRAY_INT_H

class ArrayInt{
    public:
        ArrayInt(int n, int value=0);
        ~ArrayInt();
        int &operator[](int i); 
        void print(); 
    private:
        int *p;
        int size;
};

#endif

ArrayInt.h

#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 i)
{
    return p[i];
}

ArrayInt.cpp

#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;
}