C++实验四

心已赠人 2021-12-05 05:57 264阅读 0赞

1. 车辆基本信息管理

问题场景描述如下：  
为了对车量基本信息进行管理，对现实世界车量基本信息抽象后，抽象出Car类、ElectricCar类、Battery类，  
它们之间的关系描述如下：基于Car类派生出ElectricCar类，派生类ElectricCar中新增数据成员为Battery类  
对象。

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#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

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#include"battery.h"
    
    Battery::Battery(int size):batterySize(size)
    {
    }
    int Battery::rebattery() {
        return batterySize;
    }

battery.cpp

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#ifndef BATTERY_H
    #define BATTERY_H
    
    class Battery {
    public:
        Battery(int size = 70);
        int rebattery();
        int batterySize;
    };
    
    #endif

battery.h

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#include"car.h"
    #include<string>
    #include<iostream>
    using namespace std;
    
    ostream& operator<<(ostream &out, const Car &c) {
        out << "maker:" << c.maker << endl << "moder:" << c.model << endl << "year:" << c.year << endl << "odometer:" << c.odometer << endl;
        return out;
    }
    void Car::updateOdometer(int o2) {
        if (o2 < odometer) cout << "the number is wrong" << endl;
        else odometer = o2;
    }

car.cpp

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#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) :maker(maker0), model(model0), year(year0), odometer(odometer0) {}
        friend ostream& operator<<(ostream &out, const Car &c);
        void updateOdometer(int o2);
        string maker, model;
        int year, odometer;
    };
    #endif

car.h

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#include"electricCar.h"
    #include"battery.h"
    #include"car.h"
    #include<iostream>
    using namespace std;
    
    ostream& operator<<(ostream &out, const ElectricCar &e) {
        out << "maker:" << e.maker << endl << "moder:" << e.model << endl << "year:" << e.year << endl << "odometer:" << e.odometer << endl << "batterysize:" << e.batterySize << "-kwh" << endl;
        return out;
    }
    void ElectricCar::updateOdometer(int o2) {
        if (o2 < odometer) cout << "the number is wrong" << endl;
        else odometer = o2;
    }

electricCar.cpp

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#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 maker1, string model1, int year1, int odometer1 = 0, int size1 = 70) :Car(maker1, model1, year1, odometer1), Battery(size1) {}
        friend ostream& operator<<(ostream &outCar, const ElectricCar &e);
        void updateOdometer(int o2);
    };
    #endif

electric.h

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2. 补足程序，重载运算符\[\]为一维动态整形数组类ArrayInt的成员函数，使得通过动态整形数组对象名和下标可以 访问对象中具体元素。

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#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;
    }

main.cpp

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#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;
    }
    
    void ArrayInt::print() {
        for (int i = 0; i < size; i++)
            cout << p[i] << " ";
        cout << endl;
    }
    
    int& ArrayInt:: operator[](int a)
    {
        return p[a];
    }
    // 补足:将运算符[]重载为成员函数的实现 
    // ×××

arrayInt.cpp

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

arrayInt.h

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转载于:https://www.cnblogs.com/lyc1103/p/10890495.html

[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211205/c0e07d81986045b1bd95613a9d41984c.png
[1614027-20190519195212189-1695222275.png]: /images/20211205/238cadb727a34e5781ce23cbf8d7bba5.png
[1614027-20190519195425072-2145789594.png]: /images/20211205/7ad2b51efed24ac18c22cd6f94eb37d1.png