实验5 C++
任务三：
pets.hpp
1 #pragma once 2 #include <iostream> 3 #include <string> 4 5 using namespace std; 6 7 class MachinePets{ 8 private: 9 string nickname; 10 public: 11 MachinePets(const string s): nickname{s} {} 12 string get_nickname() const; 13 virtual string talk() = 0; 14 }; 15 string MachinePets::get_nickname() const { 16 return nickname; 17 } 18 19 class PetCats: public MachinePets { 20 public: 21 PetCats(const string s) : MachinePets{s} {} 22 string talk(); 23 }; 24 string PetCats::talk() { 25 string sound{"meow~"}; 26 return sound; 27 } 28 29 class PetDogs: public MachinePets { 30 public: 31 PetDogs(const string s) : MachinePets{s} {} 32 string talk(); 33 }; 34 string PetDogs::talk() { 35 string sound{"woof!"}; 36 return sound; 37 }
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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任务四：
film.hpp
1 #pragma once 2 #include <iostream> 3 #include <string> 4 #include <iomanip> 5 6 using namespace std; 7 8 class Film{ 9 private: 10 string name, derector, region ,year; 11 public: 12 string get_year() const; 13 friend istream& operator>>(istream &in, Film &f); 14 friend ostream& operator<<(ostream &out, const Film &f); 15 }; 16 17 18 string Film::get_year() const { 19 return year; 20 } 21 istream& operator>>(istream &in, Film &f) { 22 cout << "录入片名："; 23 in >> f.name; 24 cout << "录入导演："; 25 in >> f.derector; 26 cout << "录入制片国家/地区："; 27 in >> f.region; 28 cout << "录入上映年份："; 29 in >> f.year; 30 return in; 31 } 32 ostream& operator<<(ostream &out, const Film &f) { 33 out << left; 34 out << setw(16) << f.name 35 << setw(16) << f.derector 36 << setw(16) << f.region 37 <<setw(16) << f.year ; 38 return out; 39 }
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 sort(film_lst.begin(), film_lst.end(), compare_by_year); 24 25 cout << string(20, '=') + "电影信息(按发行年份)" + string(20, '=')<< endl; 26 for(auto &f: film_lst) 27 cout << f << endl; 28 } 29 30 int main() { 31 test(); 32 }
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任务五：
Complex.hpp
1 #pragma once 2 #include <iostream> 3 4 using namespace std; 5 6 template<typename T> 7 class Complex{ 8 private: 9 T imag, real; 10 public: 11 Complex() : imag{0}, real{0} {} 12 Complex(T i, T r) : imag{i}, real{r} {} 13 Complex(const Complex &c) { 14 imag = c.imag; 15 real = c.real; 16 } 17 T get_imag() const { return imag; } 18 T get_real() const { return real; } 19 20 friend istream& operator>>(istream &in, Complex &c) { 21 in >> c.imag >> c.real; 22 return in; 23 } 24 friend ostream& operator<<(ostream &out, const Complex &c) { 25 if(c.real >= 0){ 26 out << c.imag <<" + " << c.real << 'i'; 27 } 28 else 29 out << c.imag <<" - " << -c.real << 'i'; 30 return out; 31 } 32 friend void operator+=(Complex &c1, Complex c2) { 33 c1.imag += c2.imag; 34 c1.real += c2.real; 35 } 36 friend Complex operator+(Complex c1, Complex c2) { 37 Complex c; 38 c.imag = c1.imag + c2.imag; 39 c.real = c1.real + c2.real; 40 return c; 41 } 42 friend bool operator==(Complex c1, Complex c2) { 43 if(c1.imag == c2.imag && c1.real == c2.real) 44 return true; 45 else 46 return false; 47 48 } 49 };
task5.cpp
1 #include "Complex.hpp" 2 #include <iostream> 3 4 using std::cin; 5 using std::cout; 6 using std::endl; 7 using std::boolalpha; 8 9 void test1() { 10 Complex<int> c1(2, -5), c2(c1); 11 12 cout << "c1 = " << c1 << endl; 13 cout << "c2 = " << c2 << endl; 14 cout << "c1 + c2 = " << c1 + c2 << endl; 15 16 c1 += c2; 17 cout << "c1 = " << c1 << endl; 18 cout << boolalpha << (c1 == c2) << endl; 19 } 20 21 void test2() { 22 Complex<double> c1, c2; 23 cout << "Enter c1 and c2: "; 24 cin >> c1 >> c2; 25 cout << "c1 = " << c1 << endl; 26 cout << "c2 = " << c2 << endl; 27 28 cout << "c1.real = " << c1.get_real() << endl; 29 cout << "c1.imag = " << c1.get_imag() << endl; 30 } 31 32 int main() { 33 cout << "自定义类模板Complex测试1: " << endl; 34 test1(); 35 36 cout << endl; 37 38 cout << "自定义类模板Complex测试2: " << endl; 39 test2(); 40 }
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任务六：
date.h
1 #pragma once 2 class Date { 3 private: 4 int year; 5 int month; 6 int day; 7 int totalDays; 8 public: 9 Date(int year, int month, int day); 10 int getYear() const { return year; } 11 int getMonth() const { return month; } 12 int getDay() const { return day; } 13 int getMaxDay() const; 14 bool isLeapYear() const { 15 return year % 4 == 0 && year % 100 != 0 || year % 400 == 0; 16 } 17 void show()const; 18 int operator-(const Date& date)const { 19 return totalDays - date.totalDays; 20 } 21 };
accumulator.h
1 #pragma once 2 #include"date.h" 3 class Accumulator { 4 private: 5 Date lastDate; 6 double value; 7 double sum; 8 public: 9 Accumulator(const Date& date, double value) :lastDate(date), value(value), sum{ 0 } {} 10 double getSum(const Date& date) const{ 11 return sum + value * (date - lastDate); 12 } 13 void change(const Date& date, double value) { 14 sum = getSum(date); 15 lastDate = date; 16 this->value = value; 17 } 18 void reset(const Date& date, double value) { 19 lastDate = date; 20 this->value; 21 sum = 0; 22 } 23 };
account.h
1 #pragma once 2 #include"date.h" 3 #include"accumulator.h" 4 #include<string> 5 using namespace std; 6 class Account { 7 private: 8 string id; 9 double balance; 10 static double total; 11 protected: 12 Account(const Date& date, const string &id); 13 void record(const Date& date, double amoount, const string& desc); 14 void error(const string& msg) const; 15 public:const string& getId() { return id; } 16 double getBalance() const { return balance; } 17 static double getTotal() { return total; } 18 virtual void deposit(const Date& date, double amount, const string& desc) = 0; 19 virtual void withdraw(const Date& date, double amount, const string& desc) = 0; 20 virtual void settle(const Date& date) = 0; 21 virtual void show() const; 22 }; 23 class SavingsAccount :public Account { 24 private: 25 Accumulator acc; 26 double rate; 27 public: 28 SavingsAccount(const Date& date, const string& id, double rate); 29 double getRate() const { return rate; } 30 void deposit(const Date& date, double amount, const string& desc); 31 void withdraw(const Date& date, double amount, const string& desc); 32 void settle(const Date& date); 33 }; 34 class CreditAccount :public Account { 35 private: 36 Accumulator acc; 37 double credit; 38 double rate; 39 double fee; 40 double getDebt()const { 41 double balance = getBalance(); 42 return(balance < 0 ? balance : 0); 43 } 44 public:CreditAccount(const Date& date, const string& id, double credit, double rate, double fee); 45 double getCredit()const { return credit; } 46 double getRate() const { return rate; } 47 double getFee() const { return fee; } 48 double getAvailableCredit() const { 49 if (getBalance() < 0)return credit + getBalance(); 50 else return credit; 51 } 52 void deposit(const Date& date, double amount, const string& desc); 53 void withdraw(const Date& date, double amount, const string& desc); 54 void settle(const Date& date); 55 void show() const; 56 };
date.cpp
1 #include"date.h" 2 #include<iostream> 3 #include<cstdlib> 4 using namespace std; 5 namespace { 6 const int DAYS_BEFIRE_MONTH[] = { 0,31,59,90,120,151,181,212,243,273,304 ,334,365 }; 7 } 8 Date::Date(int year, int month, int day) :year(year), month(month), day(day) { 9 if (day <= 0 || day > getMaxDay()) { 10 cout << "Invalid date: "; 11 show(); 12 cout << endl; 13 exit(1); 14 } 15 int years = year - 1; 16 totalDays = years * 365 + years / 4 - years / 100 + years / 400 + DAYS_BEFIRE_MONTH[month - 1] + day; 17 if (isLeapYear() && month > 2) totalDays++; 18 } 19 int Date::getMaxDay() const { 20 if (isLeapYear() && month == 2) 21 return 29; 22 else return DAYS_BEFIRE_MONTH[month] - DAYS_BEFIRE_MONTH[month - 1]; 23 } 24 void Date::show() const { 25 cout << getYear() << "-" << getMonth() << "-" << getDay(); 26 }
account.cpp
1 #include "account.h" 2 #include <cmath> 3 #include<iostream> 4 using namespace std; 5 double Account::total = 0; 6 Account::Account(const Date& date, const string& id) :id(id), balance(0) { 7 date.show(); 8 cout << "\t#" << id << "created" << endl; 9 } 10 void Account::record(const Date& date, double amount, const string& desc) { 11 amount = floor(amount * 100 + 0.5) / 100; 12 balance += amount; 13 total += amount; 14 date.show(); 15 cout << "\t#" << id << "\t" << amount << "\t" << balance << "\t" << desc << endl; 16 } 17 void Account::show()const { cout << id << "\tBalance:" << balance; } 18 void Account::error(const string& msg)const { 19 cout << "Error(#" << id << "):" << msg << endl; 20 } 21 SavingsAccount::SavingsAccount(const Date& date, const string& id, double rate) :Account(date, id), rate(rate), acc(date, 0) {} 22 void SavingsAccount::deposit(const Date& date, double amount, const string& desc) { 23 record(date, amount, desc); 24 acc.change(date, getBalance()); 25 } 26 void SavingsAccount::withdraw(const Date& date, double amount, const string& desc) { 27 if (amount > getBalance()) { 28 error("not enough money"); 29 } 30 else { 31 record(date, -amount, desc); 32 acc.change(date, getBalance()); 33 } 34 } 35 void SavingsAccount::settle(const Date& date) { 36 double interest = acc.getSum(date) * rate / (date-Date(date.getYear() - 1, 1, 1)); 37 if (interest != 0)record(date, interest, "interest"); 38 acc.reset(date, getBalance()); 39 } 40 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) {} 41 void CreditAccount::deposit(const Date& date, double amount, const string& desc) { 42 record(date, amount, desc); 43 acc.change(date, getDebt()); 44 } 45 void CreditAccount::withdraw(const Date& date, double amount, const string& desc) { 46 if (amount - getBalance() > credit) { 47 error("not enouogh credit"); 48 } 49 else { 50 record(date, -amount, desc); 51 acc.change(date, getDebt()); 52 } 53 } 54 void CreditAccount::settle(const Date& date) { 55 double interest = acc.getSum(date) * rate; 56 if (interest != 0) record(date, interest, "interest"); 57 if (date.getMonth() == 1)record(date, -fee, "annual fee"); 58 acc.reset(date, getDebt()); 59 } 60 void CreditAccount::show() const { 61 Account::show(); 62 cout << "\tAvailable credit:" << getAvailableCredit(); 63 }
task6.cpp
1 #include"account.h" 2 #include<iostream> 3 using namespace std; 4 int main() { 5 Date date(2008, 11, 1); 6 SavingsAccount sa1(date, "S3755217", 0.015); 7 SavingsAccount sa2(date, "02342342", 0.015); 8 CreditAccount ca(date, "C5392394", 10000, 0.0005, 50); 9 Account* accounts[] = { &sa1,&sa2,&ca }; 10 const int n = sizeof(accounts) / sizeof(Account*); 11 cout << "(d)deposit (w)withdraw (s)show (c)change day (n)next month (e)exit" << endl; 12 char cmd; 13 do { 14 date.show(); 15 cout << "\tTotal:" << Account::getTotal() << "\tcommand>"; 16 int index, day; 17 double amount; 18 string desc; 19 cin >> cmd; 20 switch (cmd) { 21 case 'd': 22 cin >> index >> amount; 23 getline(cin, desc); 24 accounts[index]->deposit(date, amount, desc); 25 break; 26 case 'w': 27 cin >> index >> amount; 28 getline(cin, desc); 29 accounts[index]->withdraw(date, amount, desc); 30 break; 31 case 's': 32 for (int i = 0; i < n; i++) { 33 cout << "[" << i << "]"; 34 accounts[i]->show(); 35 cout << endl; 36 } 37 break; 38 case 'c': 39 cin >> day; 40 if (day < date.getDay()) { 41 cout << "You cannot specify a previous day"; 42 } 43 else if (day > date.getMaxDay()) 44 cout << "Invalid day"; 45 else date = Date(date.getYear(), date.getMonth(), day); 46 break; 47 case 'n': 48 if (date.getMonth() == 12) 49 date = Date(date.getYear() + 1, 1, 1); 50 else date = Date(date.getYear(), date.getMonth() + 1, 1); 51 for (int i = 0; i < n; i++) { 52 accounts[i]->settle(date); 53 } 54 break; 55 } 56 } while (cmd != 'e'); 57 return 0; 58 }
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