实验五

实验任务3

.hpp

#include <iostream>
using std::string;
class MachinePets {
private:
string nickname;
public:
MachinePets(const string s);
string get_nickname() const;
virtual string talk() = 0;
};
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~";
}

.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();
}

实验结果：

实验任务4

实验代码：

.hpp

#include<iostream>
using std::string;
class Person {
private:
string name;
string telephone;
string email;
public:
Person() = default;
Person(string n, string t, string e = "");
Person(const Person &p);
~Person() = default;
void update_telephone();
void update_email();
friend std::istream& operator>>(std::istream &i, Person &p);
friend std::ostream& operator<<(std::ostream &o, const Person &p);
friend bool operator==(const Person &p1, const Person &p2);
};
Person::Person(string n, string t, string e)
: name{n}, telephone{t}, email{e} {
}
Person::Person(const Person &p)
: name{p.name}, telephone{p.telephone}, email{p.email} {
}
void Person::update_telephone() {
std::cin.clear();
string t;
std::cout << "输入电话号码：";
std::cin >> t;
telephone = t;
std::cout << "电话号码已更新..." << std::endl;
}
void Person::update_email() {
std::cin.clear();
string e;
std::cout << "输入email地址：";
std::cin >> e;
email = e;
std::cout << "email地址已更新..." << std::endl;
}
std::istream& operator>>(std::istream &i, Person &p) {
i >> p.name;
i >> p.telephone;
i >> p.email;
return i;
}
std::ostream& operator<<(std::ostream &o, const Person &p) {
o << "name:\t\t" << p.name << std::endl;
o << "telephone:\t" << p.telephone << std::endl;
o << "email:\t\t" << p.email << std::endl;
o << std::endl;
return o;
}
bool operator==(const Person &p1, const Person &p2) {
bool fn = (p1.name == p2.name);
bool ft = (p1.telephone == p2.telephone);
bool fe = (p1.email == p2.email);
return fn && ft && fe;
}

.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();
}

实验结果：

实验任务5

实验代码：

data.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;
}
};

data.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();
}

accumulator.h

#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;
}

};

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();
}

实验结果：