实验五继承和多态

标签：const string 继承 double void 多态 Date 实验 date

Task 3：
pets.hpp:

#include<iostream>
#include<string>

using namespace std;

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

class PetCats:public MachinePets
{
    public:
        PetCats(const string s):MachinePets(s){}
        string talk(){
            return "miao wu~";
        };
    private:
        string catvoice;
};

class PetDogs : public MachinePets{
public:
    PetDogs(const string s):MachinePets(s){}
    string talk(){
        return "wang wang~";
    };
private:
    string dogvoice;
};

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();
}

Task4:
Person.hpp:

#include<iostream>
#include<string>
#include <iomanip>

using namespace std;

class Person{
private:
    string name;
    string telephone;
    string email;
    
public:
    Person(const std::string& name = "", const std::string& telephone = "", const std::string& email = "");
    Person(const Person& p);
        void update_telephone()
    {
            cout << "输入电话号码：";
            cout<< telephone;
            cout << endl << "电话号码已更新..." << endl;
    }
    
    void update_email(){
         cout << "输入email：";
            cout<< email;
            cout << endl << "email地址已更新..." << endl;
    }
    
    friend  std::ostream& operator<<(std::ostream& out, const Person& t)
    {
            out << "name:" << t.name << endl;
            out << "telephone:" << t.telephone << endl;
            out << "email:" << t.email << endl;
            return out;
    }
    
    friend std::istream& operator>>(std::istream& in,  Person& t)
    {
        in >> t.name >> t.telephone >> t.email;
        cout << endl;
        return in;
    }
    
    friend bool operator==(const Person& s1, const Person& s2)
    {
        if (s1.name == s2.name && s1.telephone == s2.telephone && s1.email == s2.email)
            return true;
        else
            return false;
    }
};

Person::Person(const Person &p)
{
    name = p.name; telephone =p.telephone; email = p.email;
}

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();
}

Task5:
date.h:

#pragma once
#include<iostream>
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.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();
}

account.h:

#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 getToal() { 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);
    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.cpp:

#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();
}

accumulator.cpp:

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

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;
    }

};

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::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;
}

标签：const,string,继承,double,void,多态,Date,实验,date
From： https://www.cnblogs.com/yanmao/p/17873910.html

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