实验5 继承和多态

标签：const string 继承 double void 多态 Date 实验 date

实验任务3

#pragma once

#include<iostream>
#include<string>

using namespace std;

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

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

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

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

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

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

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

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

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

pets.hpp

#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

 

实验任务4

#pragma once

#include<iostream>
#include<string>

using namespace std;

class Person {
public:
    Person() = default;
    Person(const string& n, const string& t, const string& e): name{n}, telephone{t}, email{e} {}
    Person(const Person& p): name{p.name}, telephone{p.telephone}, email{p.email} {}
    
    void update_telephone();
    void update_email();

    friend bool operator==(const Person &p1, const Person &p2);
    friend ostream& operator<<(ostream &os, const Person &p);
    friend istream& operator>>(istream &is, Person &p);
    
private:
    string name, telephone, email;
};

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

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

bool operator==(const Person &p1, const Person &p2) {
    return (p1.name == p2.name && p1.telephone == p2.telephone);
}

ostream& operator<<(ostream &os, const Person &p) {
    os << "姓名：" << p.name << "，手机号码：" << p.telephone << "，邮箱：" << p.email;
    return os;
}

istream& operator>>(istream &is, Person &p) {
    getline(is, p.name);
    getline(is, p.telephone);
    getline(is, p.email);
    return is;
}

Person.hpp

#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);
       
    cin.clear();
    
    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

 

实验任务5

#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>

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.cpp

#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;
    }
};

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

8_8.cpp

 

标签：const,string,继承,double,void,多态,Date,实验,date
From： https://www.cnblogs.com/Lucky-19/p/17858865.html