实验五继承和多态

标签：const string 继承 double void 多态 Date 实验 date

任务三

pets.hpp

#pragma once

#include<iostream>
#include<string>
using namespace std;

class MachinePets {
public:
    MachinePets(const string& nickname = "");
    string getNickname() const;
    virtual string talk() = 0;

protected:
    string nickname;
};

MachinePets::MachinePets(const string& nickname) : nickname(nickname) {}

string MachinePets::getNickname() const {
    return nickname;
}

class PetCats : public MachinePets {
public:
    PetCats(const string& nickname = "");

    string talk() override;
};

PetCats::PetCats(const string& nickname) : MachinePets(nickname) {}

string PetCats::talk() {
    string talkCats = "Meow!";
    return talkCats;
}

class PetDogs : public MachinePets {
public:
    PetDogs(const string& nickname = "");

    string talk() override;
};

PetDogs::PetDogs(const string& nickname) : MachinePets(nickname) {}

string PetDogs::talk() {
    string talkDogs = "Woof!";
    return talkDogs;
}

pets.hpp

task3.cpp

#include <iostream>
#include "pets.hpp"
void play(MachinePets &obj) {
std::cout << obj.get_nickname() << " says " << obj.talk() << std::endl;
}
void test() {
PetCats cat("miku");
PetDogs dog("da huang");
play( cat );
play( dog );
}
int main() {
test();
}

task3.cpp

实验结果

任务4

Person.hpp

#pragma once

#include <iostream>
#include <string>
using namespace std;

class Person {
private:
    string name;
    string telephone;
    string email;

public:
    Person() {}
    Person(const string& name, const string& telephone, const string& email = "") : name(name), telephone(telephone), email(email) {}
    Person(const Person& other) : name(other.name), telephone(other.telephone), email(other.email) {}

    void updateTelephone() {
        cout << "请输入新的手机号码：";
        cin >> telephone;
        cout << "电话号码已更新..." << endl;
    }

    void updateEmail() {
        cout << "请输入新的邮箱地址：";
        cin >> email;
        cout << "邮箱地址已更新..." << endl;
    }

    friend ostream& operator<<(ostream& os, const Person& person) {
        os << "姓名：" << person.name << "\n手机号码：" << person.telephone << "\n邮箱地址：" << person.email;
        return os;
    }

    friend istream& operator>>(istream& is, Person& person) {
        cout << "请输入姓名: ";
        getline(is, person.name);
        if (is.eof()) {
            return is;
        }
        cout << "请输入电话号码: ";
        getline(is, person.telephone);
        cout << "请输入邮箱 (可不填): ";
        getline(is, person.email);
        cout << endl;
        return is;
    }

    friend bool operator==(const Person& person1, const Person& person2) {
        return person1.name == person2.name && person1.telephone == person2.telephone;
    }
};

Person.hpp

task4.cpp

#include <iostream>
#include <vector>
#include "Person.hpp"
void test() {
using namespace std;
vector<Person> phone_book;
Person p;
cout << "输入一组联系人的联系方式，E直至按下Ctrl+Z终止\n";
while(cin >> p)
phone_book.push_back(p);
cout << "\n更新phone_book中索引为0的联系人的手机号、邮箱:\n";
phone_book.at(0).update_telephone();
phone_book.at(0).update_email();
cout << "\n测试两个联系人是否是同一个:\n";
cout << boolalpha << (phone_book.at(0) == phone_book.at(1)) << endl;
}
int main() {
test();
}

task4.cpp

任务五

#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;
    }
};

date.h

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

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()) {
        std::cout << "Invalid date: ";
        show();
        std::cout << std::endl;
        std::exit(1);
    }
    int years = year - 1;
    totalDays = year * 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 {
    std::cout << getYear() << "-" << getMonth() << "-" << getDay();
}

date.cpp

#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);
    }

    void change(const Date& date, double value) {
        sum = getSum(date);
        lastDate = date;
        this->value = value;
        sum = 0;
    }

    void reset(const Date& date, double value) {
        lastDate = date;
        this->value = value;
        sum = 0;
    }
};

accumulator.h

#pragma once

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

class Account {
private:
    std::string id;
    double balance;
    static double total;

protected:
    Account(const Date& date, const std::string& id);
    void record(const Date& date, double amount, const std::string& desc);
    void error(const std::string& msg) const;

public:
    const std::string& getId() const { return id; }
    double getBalance() const { return balance; }
    static double getTotal() { return total; }
    virtual void deposit(const Date& date, double amount, const std::string& desc) = 0;
    virtual void withdraw(const Date& date, double amount, const std::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 std::string& id, double rate);
    double getRate() const { return rate; }
    void deposit(const Date& date, double amount, const std::string& desc);
    void withdraw(const Date& date, double amount, const std::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 std::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 std::string& desc);
    void withdraw(const Date& date, double amount, const std::string& desc);
    void settle(const Date& date);
    void show() const;
};

account.h

#include"account.h"
#include<cmath>
#include<iostream>
using namespace std;
double Account::total = 0;
Account::Account(const Date& date, const std::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();
}

account.cpp

#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::getToal() << "\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;

}

8_8.cpp

标签：const,string,继承,double,void,多态,Date,实验,date
From： https://www.cnblogs.com/grcvafg/p/17873867.html

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实验五 继承和多态

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