实验五

实验任务三：

#include<iostream>
using namespace std;
#include<string>
#include<vector>
class MachinePets {
private:
    string nickname;
public:
    MachinePets(const string s);
    virtual string talk() = 0;
    string get_nickname() const;
};

class PetCats : public MachinePets {
public:
    PetCats(const string s);
    string talk() override;
};
class PetDogs : public MachinePets {
public:
    PetDogs(const string s);
    string talk() override;
};

MachinePets::MachinePets(const string s) {
    nickname = s;
}
string MachinePets::get_nickname() const {
    return nickname;
};

PetCats::PetCats(const string s) :MachinePets(s){
   
}
string PetCats::talk() {
    return "miao wu~ " ;
}
PetDogs::PetDogs(const string s):MachinePets(s) {

}
string PetDogs::talk() {
    return  "wang wang~ " ;
}


void test() {
    using namespace std;

    vector<MachinePets*> pets;

    pets.push_back(new PetCats("miku"));
    pets.push_back(new PetDogs("da huang"));

    for (auto& ptr : pets)
        cout << ptr->get_nickname() << " says " << ptr->talk() << endl;
}

int main() {
    test();
}

　

 实验任务四：

#include<iostream>
using namespace std;
#include<string>
#include<iomanip>
#include <vector>
#include <algorithm>
class Film {
private:
	string name;
	string director;
	string area;
	string year;
public:
	Film() {}
	Film(string name, string director, string area, string year);
	friend istream& operator>>(istream& in,  Film& film);
	friend ostream& operator<<(ostream& out, const Film& film);
	string get_time()const {

		return year;
	}
};
Film::Film(string name, string director, string area, string year) {
	this->name = name;
	this->director = director;
	this->area = area;
	this->year = year;
}
ostream& operator<<(ostream& out, const Film& film) {
	out << left << setw(15) << film.name
		<< left << setw(15) << film.director
		<< left << setw(15) << film.area
		<< left << setw(15) << film.year << endl;

	return out;
}
istream& operator >> (istream& in,  Film & film) {
	cout << "录入片名：";
	in >> film.name;
	cout << endl;
	cout << "录入导演：";
	in >> film.director;
	cout << endl;
	cout << "录入制片国家或地区：";
	in >> film.area;
	cout << endl;
	cout << "录入上映年份：";
	in >> film.year;
	cout << endl;
	return in;
}

bool compare_by_year(const Film& a, const Film& b) {
	return a.get_time() < b.get_time();
}
void test() {
	using namespace std;

	int n;
	cout << "输入电影数目: ";
	cin >> n;

	cout << "录入" << n << "部影片信息" << endl;
	vector<Film> film_lst;
	for (int i = 0; i < n; ++i) {
		Film f;
		cout << string(20, '-') << "第" << i + 1 << "部影片录入" << string(20, '-') << endl;
		cin >> f;
		film_lst.push_back(f);
	}

	// 按发行年份升序排序
	sort(film_lst.begin(), film_lst.end(), compare_by_year);

	cout << string(20, '=') + "电影信息(按发行年份)" + string(20, '=') << endl;
	for (auto& f : film_lst)
		cout << f << endl;
}

int main() {
	test();
}

　　

 实验任务五：

#pragma once
#include<iostream>
#include<string>
using namespace std;
template<typename T>
class Complex{
    private:
        T real,imag;
    public:
        Complex(){}
        Complex(T x,T y):real(x),imag(y){}
        Complex(const Complex& a){
            real=a.real;
            imag=a.imag;
        }
        Complex operator+=(const Complex& a){
            real+=a.real;
            imag+=a.imag;
            return *this;
        }
        friend Complex operator+(const Complex& a,const Complex& b){
            return Complex(a.real+b.real,a.imag+b.imag);
        }
        friend istream& operator>>(istream& in,Complex& a){
            in>>a.real>>a.imag;
            return in;
        } 
        friend ostream& operator<<(ostream& out,const Complex& a){
            if(a.imag>=0)
            out<<a.real<<"+"<<a.imag<<"i";
            else
            out<<a.real<<"-"<<-a.imag<<"i";
        }
        T get_real(){
            return real;
        }
        T get_imag(){
            return imag;
        }
        friend bool operator==(const Complex& a,const Complex& b){
            return a.real==b.real&&a.imag==b.imag;
        }
        
};

　　

#include "Complex.hpp"
#include <iostream>

using std::cin;
using std::cout;
using std::endl;
using std::boolalpha;

void test1() {
    Complex<int> c1(2, -5), c2(c1);

    cout << "c1 = " << c1 << endl;
    cout << "c2 = " << c2 << endl;
    cout << "c1 + c2 = " << c1 + c2 << endl;
    
    c1 += c2;
    cout << "c1 = " << c1 << endl;
    cout << boolalpha << (c1 == c2) << endl;
}

void test2() {
    Complex<double> c1, c2;
    cout << "Enter c1 and c2: ";
    cin >> c1 >> c2;
    cout << "c1 = " << c1 << endl;
    cout << "c2 = " << c2 << endl;

    cout << "c1.real = " << c1.get_real() << endl;
    cout << "c1.imag = " << c1.get_imag() << endl;
}

int main() {
    cout << "自定义类模板Complex测试1: " << endl;
    test1();

    cout << endl;

    cout << "自定义类模板Complex测试2: " << endl;
    test2();
}

　　

 实验任务六：

#pragma once

class Date {
    private:
        int year;
        int month;
        int day;
        int totalDays;
    public:
        Date(int year, int month, int day);
        int getYear() const {
            return year;
        }
        int getMonth() const {
            return month;
        }
        int getDay() const {
            return day;
        }
        int getMaxDay() const;
        bool isLeapYear() const {
            return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
        }
        void show() const;
        int operator-(const Date& date) const {
            return totalDays - date.totalDays;
        }
};

　　

#include "date.h"
#include <iostream>
#include <cstdlib>

using namespace std;

namespace {
    const int DAYS_BEFIRE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
}

Date::Date(int year, int month, int day) : year(year), month(month), day(day) {
    if (day <= 0 || day > getMaxDay()) {
        cout << "Invalid date: ";
        show();
        cout << endl;
        exit(1);
    }
    int years = year - 1;
    totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFIRE_MONTH[month - 1] + day;
    if (isLeapYear() && month > 2) totalDays++;
}

int Date::getMaxDay() const {
    if (isLeapYear() && month == 2)
        return 29;
    else
        return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1];
}

void Date::show() const {
    cout << getYear() << "-" << getMonth() << "-" << getDay();
}

　　

#pragma once

#include "date.h"

class Accumulator {
private:
    Date lastDate;
    double value;
    double sum;

public:
    Accumulator(const Date& date, double value) : lastDate(date), value(value), sum(0) {}

    double getSum(const Date& date) const {
        return sum + value * (date - lastDate).getTotalDays(); // 假设Date类有getTotalDays()方法来计算日期差
    }

    void change(const Date& date, double value) {
        sum = getSum(date);
        lastDate = date;
        this->value = value;
    }

    void reset(const Date& date, double value) {
        lastDate = date;
        this->value = value; // 修复了原始代码中的错误，这里应该赋值
        sum = 0;
    }
};

　　

#pragma once

#include "date.h"
#include "accumulator.h"
#include <string>

using namespace std;

class Account {
private:
    string id;
    double balance;
    static double total;
protected:
    Account(const Date& date, const string &id);
    void record(const Date& date, double amount, const string& desc);
    void error(const string& msg) const;
public:
    const string& getId() {
        return id;
    }
    double getBalance() const {
        return balance;
    }
    static double getTotal() {
        return total;
    }
    virtual void deposit(const Date& date, double amount, const string& desc) = 0;
    virtual void withdraw(const Date& date, double amount, const string& desc) = 0;
    virtual void settle(const Date& date) = 0;
    virtual void show() const;
};

class SavingsAccount : public Account {
private:
    Accumulator acc;
    double rate;
public:
    SavingsAccount(const Date& date, const string& id, double rate);
    double getRate() const {
        return rate;
    }
    void deposit(const Date& date, double amount, const string& desc);
    void withdraw(const Date& date, double amount, const string& desc);
    void settle(const Date& date);
};

class CreditAccount : public Account {
private:
    Accumulator acc;
    double credit;
    double rate;
    double fee;
    double getDebt() const {
        double balance = getBalance();
        return (balance < 0 ? balance : 0);
    }
public:
    CreditAccount(const Date& date, const string& id, double credit, double rate, double fee);
    double getCredit() const {
        return credit;
    }
    double getRate() const {
        return rate;
    }
    double getFee() const {
        return fee;
    }
    double getAvailableCredit() const {
        if (getBalance() < 0) return credit + getBalance();
        else return credit;
    }
    void deposit(const Date& date, double amount, const string& desc);
    void withdraw(const Date& date, double amount, const string& desc);
    void settle(const Date& date);
    void show() const;
};

　　

#include "account.h"
#include <cmath>
#include <iostream>

using namespace std;

double Account::total = 0;

Account::Account(const Date& date, const string& id) : id(id), balance(0) {
    date.show();
    cout << "\t#" << id << " created" << endl;
}

void Account::record(const Date& date, double amount, const string& desc) {
    amount = floor(amount * 100 + 0.5) / 100;
    balance += amount;
    total += amount;
    date.show();
    cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl;
}

void Account::show() const {
    cout << id << "\tBalance:" << balance;
}

void Account::error(const string& msg) const {
    cout << "Error(#" << id << "):" << msg << endl;
}

SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) 
    : Account(date, id), rate(rate), acc(date, 0) {}

void SavingsAccount::deposit(const Date& date, double amount, const string& desc) {
    record(date, amount, desc);
    acc.change(date, getBalance());
}

void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) {
    if (amount > getBalance()) {
        error("not enough money");
    } else {
        record(date, -amount, desc);
        acc.change(date, getBalance());
    }
}

void SavingsAccount::settle(const Date& date) {
    double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1));
    if (interest != 0) record(date, interest, "interest");
    acc.reset(date, getBalance());
}

CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee) 
    : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {}

void CreditAccount::deposit(const Date& date, double amount, const string& desc) {
    record(date, amount, desc);
    acc.change(date, getDebt());
}

void CreditAccount::withdraw(const Date& date, double amount, const string& desc) {
    if (amount - getBalance() > credit) {
        error("not enough credit");
    } else {
        record(date, -amount, desc);
        acc.change(date, getDebt());
    }
}

void CreditAccount::settle(const Date& date) {
    double interest = acc.getSum(date) * rate;
    if (interest != 0) record(date, interest, "interest");
    if (date.getMonth() == 1) record(date, -fee, "annual fee");
    acc.reset(date, getDebt());
}

void CreditAccount::show() const {
    Account::show();
    cout << "\tAvailable credit:" << getAvailableCredit();
}

　　

#include"account.h"
#include<iostream> 

using namespace std;

int main() {
    Date date(2008, 11, 1);
    SavingsAccount sa1(date, "S3755217", 0.015);
    SavingsAccount sa2(date, "02342342", 0.015);
    CreditAccount ca(date, "C5392394", 10000, 0.0005, 50);
    Account* accounts[] = { &sa1,&sa2,&ca };
    const int n = sizeof(accounts) / sizeof(Account*);
    cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl;
    char cmd;
    do {
        date.show();
        cout << "\tTotal:" << Account::getTotal() << "\tcommand>";
        int index, day;
        double amount;
        string desc;
        cin >> cmd;
        switch (cmd) {
            case 'd':
                cin >> index >> amount;
                getline(cin, desc);
                accounts[index]->deposit(date, amount, desc);
                break;

            case 'w':
                cin >> index >> amount;
                getline(cin, desc);
                accounts[index]->withdraw(date, amount, desc);
                break;
            case 's':
                for (int i = 0; i < n; i++) {
                    cout << "[" << i << "]";
                    accounts[i]->show();
                    cout << endl;
                }
                break;

            case 'c':
                cin >> day;
                if (day < date.getDay()) {
                    cout << "You cannot specify a previous day";
                } else if (day > date.getMaxDay())
                    cout << "Invalid day";
                else date = Date(date.getYear(), date.getMonth(), day);
                break;
            case 'n':
                if (date.getMonth() == 12)
                    date = Date(date.getYear() + 1, 1, 1);
                else date = Date(date.getYear(), date.getMonth() + 1, 1);
                for (int i = 0; i < n; i++) {
                    accounts[i]->settle(date);
                }
                break;
        }
    } while (cmd != 'e');
    return 0;
}