实验五
任务一
publisher.hpp
1 #pragma once 2 3 #include <iostream> 4 #include <string> 5 6 using std::cout; 7 using std::endl; 8 using std::string; 9 10 // 发行/出版物类：Publisher （抽象类） 11 class Publisher { 12 public: 13 Publisher(const string &s = ""); // 构造函数 14 15 public: 16 virtual void publish() const = 0; // 纯虚函数，作为接口继承 17 virtual void use() const = 0; // 纯虚函数，作为接口继承 18 19 protected: 20 string name; // 发行/出版物名称 21 }; 22 23 Publisher::Publisher(const string &s): name {s} { 24 } 25 26 27 // 图书类: Book 28 class Book: public Publisher { 29 public: 30 Book(const string &s = "", const string &a = ""); // 构造函数 31 32 public: 33 void publish() const override; // 接口 34 void use() const override; // 接口 35 36 private: 37 string author; // 作者 38 }; 39 40 Book::Book(const string &s, const string &a): Publisher{s}, author{a} { 41 } 42 43 void Book::publish() const { 44 cout << "Publishing book: 《" << name << "》 by " << author << endl; 45 } 46 47 void Book::use() const { 48 cout << "Reading book: " << name << " by " << author << endl; 49 } 50 51 52 // 电影类: Film 53 class Film: public Publisher { 54 public: 55 Film(const string &s = "", const string &d = ""); // 构造函数 56 57 public: 58 void publish() const override; // 接口 59 void use() const override; // 接口 60 61 private: 62 string director; // 导演 63 }; 64 65 Film::Film(const string &s, const string &d): Publisher{s}, director{d} { 66 } 67 68 void Film::publish() const { 69 cout << "Publishing film: <" << name << "> directed by " << director << endl; 70 } 71 72 void Film::use() const { 73 cout << "Watching film: " << name << " directed by " << director << endl; 74 } 75 76 77 // 音乐类：Music 78 class Music: public Publisher { 79 public: 80 Music(const string &s = "", const string &a = ""); 81 82 public: 83 void publish() const override; // 接口 84 void use() const override; // 接口 85 86 private: 87 string artist; // 音乐艺术家名称 88 }; 89 90 Music::Music(const string &s, const string &a): Publisher{s}, artist{a} { 91 } 92 93 void Music::publish() const { 94 cout << "Publishing music <" << name << "> by " << artist << endl; 95 } 96 97 void Music::use() const { 98 cout << "Listening to music: " << name << " by " << artist << endl; 99 }
task1.cpp
1 #include "publisher.hpp" 2 #include <vector> 3 #include <typeinfo> 4 5 using std::vector; 6 7 void test() { 8 vector<Publisher *> v; 9 10 v.push_back(new Book("Harry Potter", "J.K. Rowling")); 11 v.push_back(new Film("The Godfather", "Francis Ford Coppola")); 12 v.push_back(new Music("Blowing in the wind", "Bob Dylan")); 13 14 for(auto &ptr: v) { 15 cout << "pointer type: " << typeid(ptr).name() << endl; // 输出指针类型 16 cout << "RTTI type: " << typeid(*ptr).name() << endl; // 输出指针指向的对象类型 17 ptr->publish(); 18 ptr->use(); 19 cout << endl; 20 } 21 } 22 23 int main() { 24 test(); 25 }
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任务2
book.hpp
1 #pragma once 2 3 #include <string> 4 #include <iostream> 5 #include <iomanip> 6 7 using std::string; 8 using std::ostream; 9 using std::endl; 10 using std::setw; 11 using std::left; 12 13 class Book { 14 public: 15 Book(const string &name, const string &author, const string &translator, const string &isbn, float price); 16 17 friend ostream& operator<<(ostream &out, const Book &book); 18 19 private: 20 string name; // 书名 21 string author; // 作者 22 string translator; // 译者 23 string isbn; // isbn号 24 float price; // 定价 25 }; 26 27 // 成员函数实现 28 Book::Book(const string &name, const string &author, const string &translator, const string &isbn, float price) { 29 this->name = name; 30 this->author = author; 31 this->translator = translator; 32 this->isbn = isbn; 33 this->price = price; 34 } 35 36 // 友元实现 37 ostream& operator<<(ostream &out, const Book &book) { 38 out << left; 39 out << setw(15) << "书名:" << book.name << endl 40 << setw(15) << "作者:" << book.author << endl 41 << setw(15) << "译者:" << book.translator << endl 42 << setw(15) << "ISBN:" << book.isbn << endl 43 << setw(15) << "定价:" << book.price; 44 45 return out; 46 }
booksale.hpp
1 #pragma once 2 3 #include "book.hpp" 4 #include <iostream> 5 #include <string> 6 #include <iomanip> 7 8 using std::string; 9 using std::cout; 10 using std::endl; 11 using std::setw; 12 13 class BookSale { 14 public: 15 BookSale(const Book &b, float price, int amount); 16 int get_amount() const; 17 18 friend ostream& operator<<(ostream &out, const BookSale &item); 19 20 private: 21 Book rb; 22 float sales_price; // 售价 23 int sales_amount; // 销售数量 24 float revenue; // 营收 25 }; 26 27 // 成员函数实现 28 BookSale::BookSale(const Book &b, float price, int amount): rb{b}, sales_price(price), sales_amount{amount} { 29 revenue = sales_amount * sales_price; 30 } 31 32 int BookSale::get_amount() const { 33 return sales_amount; 34 } 35 36 // 友元函数实现 37 ostream& operator<<(ostream &out, const BookSale &item) { 38 out << left; 39 out << item.rb << endl 40 << setw(15) << "售价:" << item.sales_price << endl 41 << setw(15) << "销售数量:" << item.sales_amount << endl 42 << setw(15) << "营收:" << item.revenue; 43 44 return out; 45 }
task2.cpp
1 #pragma once 2 3 #include "book.hpp" 4 #include <iostream> 5 #include <string> 6 #include <iomanip> 7 8 using std::string; 9 using std::cout; 10 using std::endl; 11 using std::setw; 12 13 class BookSale { 14 public: 15 BookSale(const Book &b, float price, int amount); 16 int get_amount() const; 17 18 friend ostream& operator<<(ostream &out, const BookSale &item); 19 20 private: 21 Book rb; 22 float sales_price; // 售价 23 int sales_amount; // 销售数量 24 float revenue; // 营收 25 }; 26 27 // 成员函数实现 28 BookSale::BookSale(const Book &b, float price, int amount): rb{b}, sales_price(price), sales_amount{amount} { 29 revenue = sales_amount * sales_price; 30 } 31 32 int BookSale::get_amount() const { 33 return sales_amount; 34 } 35 36 // 友元函数实现 37 ostream& operator<<(ostream &out, const BookSale &item) { 38 out << left; 39 out << item.rb << endl 40 << setw(15) << "售价:" << item.sales_price << endl 41 << setw(15) << "销售数量:" << item.sales_amount << endl 42 << setw(15) << "营收:" << item.revenue; 43 44 return out; 45 }
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任务3
pets.hpp
1 #ifndef PETS_HPP 2 #define PETS_HPP 3 4 #include <iostream> 5 #include <string> 6 #include <vector> 7 #include <memory> 8 9 class MachinePets { 10 protected: 11 std::string nickname; 12 13 public: 14 MachinePets(const std::string &s) : nickname(s) {} 15 std::string get_nickname() const { return nickname; } 16 virtual std::string talk() const = 0; 17 virtual ~MachinePets() = default; 18 }; 19 20 class PetCats : public MachinePets { 21 public: 22 PetCats(const std::string &s) : MachinePets(s) {} 23 std::string talk() const override { 24 return "miao wu~"; 25 } 26 }; 27 28 class PetDogs : public MachinePets { 29 public: 30 PetDogs(const std::string &s) : MachinePets(s) {} 31 std::string talk() const override { 32 return "wang wang~"; 33 } 34 }; 35 36 #endif // PETS_HP
task3.cpp
1 #include <iostream> 2 #include <vector> 3 #include "pets.hpp" 4 5 void test() { 6 using namespace std; 7 8 vector<MachinePets *> pets; 9 10 pets.push_back(new PetCats("miku")); 11 pets.push_back(new PetDogs("da huang")); 12 13 for(auto &ptr: pets) 14 cout <<ptr->get_nickname() << " says " << ptr->talk() << endl; 15 } 16 17 int main() { 18 test(); 19 }
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任务4
film.hpp
1 #ifndef FILM_HPP 2 #define FILM_HPP 3 4 #include <iostream> 5 #include <string> 6 #include <vector> 7 #include <algorithm> 8 9 // 定义电影类 Film 10 class Film { 11 private: 12 std::string title; // 片名 13 std::string director; // 导演 14 std::string country; // 制片国家/地区 15 int release_year; // 上映年份 16 17 public: 18 // 默认构造函数 19 Film() : title(""), director(""), country(""), release_year(0) {} 20 21 // 带参数的构造函数 22 Film(const std::string &t, const std::string &d, const std::string &c, int y) 23 : title(t), director(d), country(c), release_year(y) {} 24 25 // 获取上映年份，用于排序 26 int get_release_year() const { 27 return release_year; 28 } 29 friend std::istream &operator>>(std::istream &is, Film &f) { 30 std::cout << "输入片名: "; 31 is.ignore(); 32 std::getline(is, f.title); 33 34 std::cout << "输入导演: "; 35 std::getline(is, f.director); 36 37 std::cout << "输入制片国家/地区: "; 38 std::getline(is, f.country); 39 40 std::cout << "输入上映年份: "; 41 is >> f.release_year; 42 43 return is; 44 } 45 friend std::ostream &operator<<(std::ostream &os, const Film &f) { 46 os << f.title << " " 47 << f.director << " " 48 << f.country << " " 49 << f.release_year<<"\n"; 50 return os; 51 } 52 }; 53 bool compare_by_year(const Film &f1, const Film &f2) { 54 return f1.get_release_year() < f2.get_release_year(); 55 } 56 57 #endif // FILM_HPP
task4.cpp
1 #include "film.hpp" 2 #include <iostream> 3 #include <string> 4 #include <vector> 5 #include <algorithm> 6 7 void test() { 8 using namespace std; 9 10 int n; 11 cout << "输入电影数目: "; 12 cin >> n; 13 14 cout << "录入" << n << "部影片信息" << endl; 15 vector<Film> film_lst; 16 for(int i = 0; i < n; ++i) { 17 Film f; 18 cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl; 19 cin >> f; 20 film_lst.push_back(f); 21 } 22 23 // 按发行年份升序排序 24 sort(film_lst.begin(), film_lst.end(), compare_by_year); 25 26 cout << string(20, '=') + "电影信息(按发行年份)" + string(20, '=')<< endl; 27 for(auto &f: film_lst) 28 cout << f << endl; 29 } 30 31 int main() { 32 test(); 33 }
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任务5
Complex.hpp
1 #ifndef COMPLEX_HPP 2 #define COMPLEX_HPP 3 4 #include <iostream> 5 #include <cmath> 6 7 template<typename T> 8 class Complex { 9 private: 10 T real; // 实部 11 T imag; // 虚部 12 13 public: 14 Complex(T real = T(), T imag = T()) : real(real), imag(imag) {} 15 16 Complex(const Complex& other) : real(other.real), imag(other.imag) {} 17 18 T get_real() const { return real; } 19 T get_imag() const { return imag; } 20 Complex& operator+=(const Complex& other) { 21 real += other.real; 22 imag += other.imag; 23 return *this; 24 } 25 friend Complex operator+(const Complex& lhs, const Complex& rhs) { 26 return Complex(lhs.real + rhs.real, lhs.imag + rhs.imag); 27 } 28 friend bool operator==(const Complex& lhs, const Complex& rhs) { 29 return lhs.real == rhs.real && lhs.imag == rhs.imag; 30 } 31 friend std::istream& operator>>(std::istream& in, Complex& c) { 32 in >> c.real >> c.imag; 33 return in; 34 } 35 friend std::ostream& operator<<(std::ostream& out, const Complex& c) { 36 if(c.imag<0) 37 out << " " << c.real << " " << c.imag << "i"; 38 else{ 39 out << " " << c.real << "+ " << c.imag << "i"; 40 } 41 return out; 42 } 43 }; 44 45 #endif // COMPLEX_HPP
task5.cpp
1 #include "Complex.hpp" 2 #include <iostream> 3 using std::cin; 4 using std::cout; 5 using std::endl; 6 using std::boolalpha; 7 8 void test1() { 9 Complex<int> c1(2, -5), c2(c1); 10 cout << "c1 = " << c1 << endl; 11 cout << "c2 = " << c2 << endl; 12 cout << "c1 + c2 = " << c1 + c2 << endl; 13 c1 += c2; 14 cout << "c1 = " << c1 << endl; 15 cout << boolalpha << (c1 == c2) << endl; 16 } 17 void test2() { 18 Complex<double> c1, c2; 19 cout << "Enter c1 and c2: "; 20 cin >> c1 >> c2; 21 cout << "c1 = " << c1 << endl; 22 cout << "c2 = " << c2 << endl; 23 cout << "c1.real = " << c1.get_real() << endl; 24 cout << "c1.imag = " << c1.get_imag() << endl; 25 } 26 27 int main() { 28 cout << "自定义类模板Complex测试1: " << endl; 29 test1(); 30 cout << endl; 31 cout << "自定义类模板Complex测试2: " << endl; 32 test2(); 33 }
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date.h
1 #pragma once 2 3 class Date { 4 private: 5 int year; 6 int month; 7 int day; 8 int totalDays; 9 10 public: 11 Date(int year, int month, int day); 12 int getYear() const { return year; } 13 int getMonth() const { return month; } 14 int getDay() const { return day; } 15 int getMaxDay() const; 16 bool isLeapYear() const { 17 return year % 4 == 0 && year % 100 != 0 || year % 400 == 0; 18 19 } 20 void show() const; 21 int operator-(const Date & date) const { 22 return totalDays - date.totalDays; 23 24 } 25 26 };
date.cpp
1 #include "date.h" 2 #include <iostream> 3 #include <cstdlib> 4 using namespace std; 5 6 namespace { 7 const int DAYS_BEFORE_MONTH[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }; 8 9 } 10 11 Date::Date(int year, int month, int day) : year(year), month(month), day(day) { 12 if (day <= 0 || day > getMaxDay()) { 13 cout << "Invalid date: "; 14 show(); 15 cout << endl; 16 exit(1); 17 18 } 19 int years = year - 1; 20 totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFORE_MONTH[month - 1] + day; 21 if (isLeapYear() && month > 2) totalDays++; 22 23 } 24 25 int Date::getMaxDay() const { 26 if (isLeapYear() && month == 2) 27 return 29; 28 else return DAYS_BEFORE_MONTH[month] - DAYS_BEFORE_MONTH[month - 1]; 29 30 } 31 32 void Date::show() const { 33 cout << getYear() << "-" << getMonth() << "-" << getDay(); 34 35 }
account.h
1 #pragma once 2 #include "date.h" 3 #include "accumulator.h" 4 #include <string> 5 using namespace std; 6 7 class Account { 8 private: 9 string id; 10 double balance; 11 static double total; 12 protected: 13 Account(const Date& date, const string& id); 14 void record(const Date& date, double amount, const string& desc); 15 void error(const string& msg) const; 16 17 public: 18 const string& getId() { return id; } 19 double getBalance() const { return balance; } 20 static double getTotal() { return total; } 21 virtual void deposit(const Date& date, double amount, const string& desc) = 0; 22 virtual void withdraw(const Date& date, double amount, const string& desc) = 0; 23 virtual void settle(const Date& date) = 0; 24 virtual void show() const; 25 26 }; 27 28 class SavingsAccount : public Account { 29 private: 30 Accumulator acc; 31 double rate; 32 public: 33 SavingsAccount(const Date& date, const string& id, double rate); 34 double getRate() const { return rate; } 35 void deposit(const Date& date, double amount, const string& desc); 36 void withdraw(const Date& date, double amount, const string& desc); 37 void settle(const Date& date); 38 39 }; 40 41 class CreditAccount : public Account { 42 private: 43 Accumulator acc; 44 double credit; 45 double rate; 46 double fee; 47 double getDebt() const { 48 double balance = getBalance(); 49 return (balance < 0 ? balance : 0); 50 51 } 52 public: 53 CreditAccount(const Date& date, const string& id, double credit, double rate, double fee); 54 double getCredit() const { return credit; } 55 double getRate() const { return rate; } 56 double getFee() const { return fee; } 57 double getAvailableCredit() const { 58 if (getBalance() < 0) return credit + getBalance(); 59 else return credit; 60 61 } 62 void deposit(const Date& date, double amount, const string& desc); 63 void withdraw(const Date& date, double amount, const string& desc); 64 void settle(const Date& date); 65 void show() const; 66 67 };
account.cpp
1 #include "account.h" 2 #include <cmath> 3 #include<iostream> 4 using namespace std; 5 6 double Account::total = 0; 7 Account::Account(const Date& date, const string& id) : id(id), balance(0) { 8 date.show(); 9 cout << "\t#" << id << " created" << endl; 10 11 } 12 13 void Account::record(const Date& date, double amount, const string& desc) { 14 amount = floor(amount * 100 + 0.5) / 100; 15 balance += amount; 16 total += amount; 17 date.show(); 18 cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl; 19 20 } 21 22 void Account::show() const { 23 cout << id << "\tBalance: " << balance; 24 25 } 26 27 void Account::error(const string& msg) const { 28 cout << "Error (#" << id << "): " << msg << endl; 29 30 } 31 32 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) 33 : Account(date, id), rate(rate), acc(date, 0) {} 34 35 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) { 36 record(date, amount, desc); 37 acc.change(date, getBalance()); 38 39 } 40 41 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) { 42 if (amount > getBalance()) { 43 error("not enough money"); 44 45 } 46 else { 47 record(date, -amount, desc); 48 acc.change(date, getBalance()); 49 50 } 51 52 } 53 54 void SavingsAccount::settle(const Date& date) { 55 if (date.getMonth() == 1) 56 { 57 double interest = acc.getSum(date) * rate / (date - Date(date.getYear() - 1, 1, 1)); 58 if (interest != 0) record(date, interest, "interest"); 59 acc.reset(date, getBalance()); 60 } 61 } 62 63 CreditAccount::CreditAccount(const Date& date, const string& id, double credit, double rate, double fee) 64 : Account(date, id), credit(credit), rate(rate), fee(fee), acc(date, 0) {} 65 66 void CreditAccount::deposit(const Date& date, double amount, const string& desc) { 67 record(date, amount, desc); 68 acc.change(date, getDebt()); 69 70 } 71 72 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) { 73 if (amount - getBalance() > credit) { 74 error("not enough credit"); 75 76 } 77 else { 78 record(date, -amount, desc); 79 acc.change(date, getDebt()); 80 81 } 82 83 } 84 85 void CreditAccount::settle(const Date& date) { 86 double interest = acc.getSum(date) * rate; 87 if (interest != 0) record(date, interest, "interest"); 88 if (date.getMonth() == 1) record(date, -fee, "annual fee"); 89 acc.reset(date, getDebt()); 90 91 } 92 93 void CreditAccount::show() const { 94 Account::show(); 95 cout << "\tAvailable credit: " << getAvailableCredit(); 96 97 }
accumulator.h
1 #pragma once 2 #include "date.h" 3 4 class Accumulator { 5 private: 6 Date lastDate; 7 double value; 8 double sum; 9 10 public: 11 12 double getSum(const Date& date) const { 13 return sum + value * (date - lastDate); 14 15 } 16 Accumulator(const Date& date, double value) : lastDate(date), value(value), sum{ 0 } {} 17 18 void change(const Date& date, double value) { 19 sum = getSum(date); 20 lastDate = date; 21 this->value = value; 22 23 } 24 25 void reset(const Date& date, double value) { 26 lastDate = date; 27 this->value = value; 28 sum = 0; 29 } 30 31 };
task6.cpp
1 #include "account.h" 2 #include<iostream> 3 using namespace std; 4 5 int main() { 6 Date date(2008, 11, 1); 7 SavingsAccount sa1(date, "S3755217", 0.015); 8 SavingsAccount sa2(date, "02342342", 0.015); 9 CreditAccount ca(date, "C5392394", 10000, 0.0005, 50); 10 Account* accounts[] = { &sa1, &sa2, &ca }; 11 const int n = sizeof(accounts) / sizeof(Account*); 12 cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl; 13 char cmd; 14 do { 15 date.show(); 16 cout << "\tTotal:" << Account::getTotal() << "\tcommand>"; 17 int index, day; 18 double amount; 19 string desc; 20 cin >> cmd; 21 switch (cmd) { 22 case 'd': 23 cin >> index >> amount; 24 getline(cin, desc); 25 accounts[index]->deposit(date, amount, desc); 26 break; 27 case 'w': 28 cin >> index >> amount; 29 getline(cin, desc); 30 accounts[index]->withdraw(date, amount, desc); 31 break; 32 case 's': 33 for (int i = 0; i < n; i++) { 34 cout << "[" << i << "]"; 35 accounts[i]->show(); 36 cout << endl; 37 38 } 39 break; 40 case 'c': 41 cin >> day; 42 if (day < date.getDay()) { 43 cout << "You cannot specify a previous day"; 44 45 } 46 else if (day > date.getMaxDay()) 47 cout << "Invalid day"; 48 else date = Date(date.getYear(), date.getMonth(), day); 49 break; 50 case 'n': 51 if (date.getMonth() == 12) 52 date = Date(date.getYear() + 1, 1, 1); 53 else 54 { 55 date = Date(date.getYear(), date.getMonth() + 1, 1); 56 } 57 for (int i = 0; i < n; i++) { 58 accounts[i]->settle(date); 59 60 } 61 break; 62 63 } 64 65 } while (cmd != 'e'); 66 return 0; 67 68 }
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