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实验5 继承和多态

时间：2023-12-04 10:16:21浏览次数：35  
标签：const string 继承 double void 多态 Date 实验 date

实验任务三

pets.hpp

#pragma once

#include <iostream>
#include <string>

using namespace std;

class MachinePets {
protected:
    string nickname;
public:
    MachinePets(const string s) :nickname(s) {};
public:
    virtual string talk() = 0;
    string get_nickname() const { return nickname; }
};





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

PetCats::PetCats(const string s) : MachinePets{ s } {
}

string PetCats::talk() {
    return "miao wu~";
}

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

PetDogs::PetDogs(const string s) : MachinePets{ s } {
}

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

pets.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();
}

运行结果

实验任务四

Person.hpp

#pragma once

#include <iostream>
#include <string>

using namespace std;
class Person {
private:
    string name, telephone, email;
public:
    Person()
    {

    }
    Person(const string& name, const string& telephone, const string& email): name{ name }, telephone{ telephone }, email{ email } 
    {
    }
    Person(const Person& p):name{ p.name }, telephone{ p.telephone }, email{ p.email } 
    {
    }

    void update_telephone();
    void update_email();

    friend std::ostream& operator<<(std::ostream& os, const Person& p);
    friend std::istream& operator>>(std::istream& is, Person& p);
    friend bool operator==(const Person& p1, const Person& p2);
};






std::ostream& operator<<(std::ostream& os, const Person& p) {
    os << p.name << endl;
    os << p.telephone << endl;
    os << p.email << endl;
    return os;
}

std::istream& operator>>(std::istream& is, Person& p) {
    is >> p.name >> p.telephone >> p.email;
    cout << endl;
    return is;
}

bool operator==(const Person& p1, const Person& p2) {
    if (p1.name == p2.name && p1.telephone == p2.telephone && p1.email == p2.email)
        return 1;
    else
        return 0;
}

void Person::update_telephone() {
    cin.clear();
    cout << "输入电话号码：";
    string t;
    getline(cin, t);
    telephone = t;
    cout << "电话号码已更新..." << endl;
}

void Person::update_email() {
    cin.clear();
    cout << "输入email地址：";
    string e;
    getline(cin, e);
    email = e;
    cout << "email地址已更新..." << endl;
}

Person.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();
}

运行结果

实验任务5

8.8.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::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;
}

account.cpp

#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();
}

account.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;
};

accumulator.h

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

date.cpp

#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();
}

date.h

#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;
    }
};

运行结果

标签：const,string,继承,double,void,多态,Date,实验,date
From： https://www.cnblogs.com/moliqi1/p/17874282.html

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