c++实验五

实验任务3：

#pragma once
#include<string>
using namespace std;
class MachinePets {
public:
    MachinePets(const std::string s); 
    virtual string talk() const = 0;
    string nickname;
    string get_nickname()const{return nickname;}
};
MachinePets::MachinePets(const string s):nickname(s){}
class PetCats : public MachinePets {
public:
    PetCats(const string &s);
    string talk() const override;
};
PetCats::PetCats(const string &s):MachinePets(s){}
string PetCats::talk()const{return "miao wu~";}
class PetDogs : public MachinePets {
public:
    PetDogs(const string &s);
    string talk() const override;
};
PetDogs::PetDogs(const string &s):MachinePets(s){}
string PetDogs::talk()const{return "wang wang~";}

#include <iostream>
 #include <vector>
 #include "pets.hpp"
 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4：

#pragma once 
#include <iostream>
#include <string>
using namespace std;
class Film {
private:
    string title; 
    string director; 
    string country;  
    int year;

public:
    Film():title(""),director(""),country(""),year(0){}
    Film(string t,string d,string c,int y):title(t),director(d),country(c),year(y){}
    friend istream &operator>>(istream &is, Film &f){
        cout<<"输入片名: ";
        is>>f.title;
        cout<<"输入导演: ";
        is>>f.director;
        cout<<"输入制片国家/地区: ";
        is>>f.country;
        cout<<"输入上映年份: ";
        is>>f.year;
        return is;
    }
    friend ostream& operator<<(ostream &os, const Film &f) {
        os<<"片名: "<<f.title<<", 导演: "<<f.director<<", 制片国家/地区: "<<f.country<<", 上映年份: "<<f.year;
        return os;
    }
    static bool compare_by_year(const Film &a, const Film &b){
        return a.year<b.year;
    }
};

#include "film.hpp"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

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5：

#pragma once
#include<iostream>
using namespace std;
template<typename T>
class Complex{
public:
    Complex(T r=0,T i=0):real(r),imag(i){}
    Complex(const Complex &other):real(other.real),imag(other.imag){}
    Complex &operator+=(const Complex &other){
        real+=other.real;
        imag+=other.imag;
        return *this;
    }
    Complex operator+(const Complex &other)const{
        return Complex(real+other.real,imag+other.imag);
    }
    bool operator==(const Complex& other) const {
        return (real==other.real)&&(imag==other.imag);
    }
    T get_real()const{return real;}
    T get_imag()const{return imag;}
    friend istream &operator>>(istream &is,Complex &c){
        char sign='+';
        is>>c.real;
        if(is.peek()=='+'||is.peek()=='-'){
            is.get(sign);
        }
        is>>c.imag;
        if(is.peek()=='i'){
            is.get();
        }
        if(sign=='-'){
            c.imag*=-1;
        }
        return is;
    }
    friend ostream &operator<<(ostream &os, const Complex &c){
        os<<c.real;
        if(c.imag>=0){
            os<<"+";
        }
        os<<c.imag<<"i";
        return os;
    }
private:
    T real;
    T imag;
};

#include "Complex5.5.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6：

#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_BEFORE_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_BEFORE_MONTH[month - 1] + day;
    if (isLeapYear() && month > 2) totalDays++;
} 
int Date::getMaxDay() const {
    if (isLeapYear() && month == 2)
        return 29;
    else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_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: 
    double getSum(const Date& date) const {
        return sum + value * (date - lastDate);
    }
    Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {}

    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;
        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) {
    if (date.getMonth() == 1)
    {
        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;
}