一、实验结论
1.车辆信息管理
源代码：
battery.h：
#ifndef BATTERY_H
#define BATTERY_H
class Battery {
public:
Battery(int sz = 70) :batterySize(sz) {}
int getSize() const;
private:
int batterySize;
};
#endif
car.h：
#ifndef CAR_H
#define CAR_H
#include
#include
using namespace std;
class Car {
public:
Car(string mak, string mod, int y) :maker(mak), model(mod), year(y), odometer(0) {}
friend ostream& operator<<(ostream& out, const Car& c);
void updateOdometer(int);
private:
string maker;
string model;
int year;
int odometer;
};
#endif
electricCar.h：
#ifndef ELECTRICCAR_H
#define ELECTRICCAR_H
#include "car.h"
#include "battery.h"
class ElectricCar :public Car {
public:
ElectricCar(string mak, string mod, int y) :Car(mak, mod, y) {}
friend ostream& operator<<(ostream& out, const ElectricCar& ec);
private:
Battery battery;
};
#endif
battery.cpp：
#include "battery.h"
int Battery::getSize() const{
return batterySize;
}
car.cpp：
#include "car.h"
ostream& operator<<(ostream& out, const Car& c) {
out << "maker: " << c.maker << endl;
out << "moder: " << c.model << endl;
out << "year: " << c.year << endl;
out << "odometer: " << c.odometer;
return out;
}
void Car::updateOdometer(int meter) {
if (meter < odometer) {
cout << "Illegal!" << endl;
return;
}
odometer = meter;
}
electricCar.h：
#include "electricCar.h"
ostream& operator<<(ostream& out, const ElectricCar& ec) {
Car tmp = ec;
out << tmp << endl;
out << "batterySize: " << (ec.battery).getSize()<<"-kWh";
return out;
}
main.cpp：
#include
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;
}
运行结果：
1.重载运算符[]为一维动态整形数组类ArrayInt的成员函数
源代码：
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);
void print();
private:
int* p;
int size;
};
#endif
arrayInt.cpp：
#include "arrayInt.h"
#include
#include
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 idx) {
return p[idx];
}
main.cpp：
#include
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;
}
运行结果：
二、实验总结与体会
没收到deadline通知邮件所以完全忘了还有这么个实验，好在还是在截止前发现并完成了。可能是因为太简单吧，实验过程中并没有踩到什么坑。非要说的话，第一题electricCar.cpp第五行和第六行出于简洁起见我原本写的是out< 这个愚蠢的错误其实我当时立刻就发现并更正了……所以上面这两张图完全是为了丰富实验总结与体会部分的内容而特意把它重新改回来又运行的……啧啧啧，真是用心良苦_(:з」∠)_ 
