c++实验四

Posted 2021-12-01 csl-40

battery.h:

#ifndef BATTERY_H
#define BATTERY_H
using namespace std;
class Battery{
    public:
        Battery(int a=70);
        int getbatterysize();
        int batterysize;
};
#endif

battery.cpp:

#include "battery.h"
#include<iostream>
using namespace std;
Battery::Battery(int a):batterysize(a){
}
int Battery::getbatterysize(){
    return batterysize;
}

car.h:

#ifndef CAR_H
#define CAR_H
#include<iostream>
using std::string;
using std::ostream;
class Car{
    public:
        Car(string a,string b,int c,int d=0);
        friend ostream&operator<<(ostream &out,Car &c1);
        void updateOdometer(int e);
        string maker,model;
        int year,odometer;
};
#endif

car.cpp；

#include "car.h"
#include<iostream>
#include<string>
using namespace std;
Car::Car(string a,string b,int c,int d){
    maker=a;
    model=b;
    year=c;
    odometer=d;
}
ostream &operator<<(ostream &out,Car &c1){
    out<<"maker:"<<c1.maker<<endl
       <<"model:"<<c1.model<<endl
       <<"year:"<<c1.year<<endl
       <<"odometer:"<<c1.odometer<<endl;
       return out;
}
void Car::updateOdometer(int e){
    if(e<odometer){
        cout<<"updatemeter is wrong"<<endl;
    }
    else{
        odometer=e;
    }
}

electriccar.h:

#ifndef ELECTRICCAR_H
#define ELECTRICCAR_H
#include "battery.h"
#include "car.h"
class ElectricCar :public Car, public Battery {
public:
    ElectricCar(string a, string b, int c, int d=0,int e=70);
    friend ostream&operator<<(ostream &out, ElectricCar &c1);
private:
    Battery battery;

};
#endif 

electriccar.cpp:

#include "electricCar.h"
#include "car.h"
#include "battery.h"
#include <iostream>
using namespace std;
ElectricCar::ElectricCar(string a, string b, int c, int d, int e) :Car(a, b, c, d),Battery(e){

}
ostream &operator<<(ostream &out, ElectricCar &c1) {
    out << "maker:" << c1.maker << endl
        << "model:" << c1.model << endl
        << "year:" << c1.year << endl
        << "odometer:" << c1.odometer << endl
        << "batterysize:" << c1.batterysize <<"-kwh"<< endl;
        return out;
}

main.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;
}

运行截图：

arrayInt.h:

#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 x);
        void print(); 
    private:
        int *p;
        int size;
};

#endif

arrayInt.cpp:

#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;
}

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

main.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;
}

运行截图: