实验5
pets.hpp
#include <iostream> #include <vector> #include <string> using namespace std; using std::string; class MachinePets { protected: string nickname; public: MachinePets(const string s): nickname{s} {} virtual string get_nickname() = 0; virtual string talk() = 0; }; class PetCats: public MachinePets { public: PetCats(const string &s): MachinePets(s) {} string get_nickname() { return nickname; } string talk() { return "miao"; } }; class PetDogs: public MachinePets { public: PetDogs(const string &s): MachinePets(s) {} string get_nickname() { return nickname; } string talk() { return "wang wang"; } };
task3.cpp
#include <iostream> #include <vector> #include "pets.hpp" void test() { using namespace std; vector<MachinePets *> pets; pets.push_back(new PetCats("miku")); pets.push_back(new PetDogs("da huang")); for(auto &ptr: pets) cout <<ptr->get_nickname() << " says " << ptr->talk() << endl; } int main() { test(); }
film.hpp
#include <iostream> #include <string> #include <vector> #include <iomanip> #include <algorithm> using namespace std; using std::string; class Film { private: string name; string director; string area; int year; public: Film() {} Film(const string N, const string D, const string A, const int Y): name{N},director{D},area{A},year{Y} {} friend istream& operator>>(istream &in, Film &f){ string N,D,A; int Y; cout<<"录入片名："; in>>N; f.name=N; cout<<"录入导演："; in>>D; f.director=D; cout<<"录入制片国家/地区："; in>>A; f.area=A; cout<<"录入上映年份："; in>>Y; f.year=Y; return in; } friend ostream& operator<<(ostream &out, const Film &f){ out<<left<<setw(10)<<f.name <<setw(10)<<f.director <<setw(10)<<f.area <<setw(10)<<f.year; return out; } int get_year() const { return year; } };
task4.cpp
#include "film.hpp" #include <iostream> #include <string> #include <vector> #include <algorithm> bool compare_by_year(const Film &f1, const Film &f2){ return f1.get_year() < f2.get_year(); } void test() { using namespace std; int n; cout << "输入电影数目: "; cin >> n; cout << "录入" << n << "部影片信息" << endl; vector<Film> film_lst; for(int i = 0; i < n; ++i) { Film f; cout << string(20, '-') << "第" << i+1 << "部影片录入" << string(20, '-') << endl; cin >> f; film_lst.push_back(f); } // 按发行年份升序排序 sort(film_lst.begin(), film_lst.end(), compare_by_year); cout << string(20, '=') + "电影信息(按发行年份)" + string(20, '=')<< endl; for(auto &f: film_lst) cout << f << endl; } int main() { test(); }
Complex.hpp
#include <iostream> using namespace std; template <typename T> class Complex { private: T real, imag; public: Complex(T r=0, T i=0): real{r},imag{i} {} Complex(const Complex &c): real{c.real},imag{c.imag} {} T get_real() { return real; } T get_imag() { return imag; } Complex operator+=(const Complex &c){ real += c.real; imag += c.imag; return *this; } bool operator==(const Complex &c){ if( real==c.real && imag==c.imag ) return true; else return false; } friend Complex operator+(const Complex &c1,const Complex &c2){ return Complex(c1.real+c2.real,c1.imag+c2.imag); } friend ostream& operator<<(ostream &out, const Complex &c){ if(c.imag>=0) out<< c.real <<" + "<< c.imag <<"i"; else out<< c.real <<" - "<< -c.imag <<"i"; return out; } friend istream& operator>>(istream &in, Complex &c){ in >> c.real >> c.imag ; return in; } };
task5.cpp
#include "Complex.hpp" #include <iostream> using std::cin; using std::cout; using std::endl; using std::boolalpha; void test1() { Complex<int> c1(2, -5), c2(c1); cout << "c1 = " << c1 << endl; cout << "c2 = " << c2 << endl; cout << "c1 + c2 = " << c1 + c2 << endl; c1 += c2; cout << "c1 = " << c1 << endl; cout << boolalpha << (c1 == c2) << endl; } void test2() { Complex<double> c1, c2; cout << "Enter c1 and c2: "; cin >> c1 >> c2; cout << "c1 = " << c1 << endl; cout << "c2 = " << c2 << endl; cout << "c1.real = " << c1.get_real() << endl; cout << "c1.imag = " << c1.get_imag() << endl; } int main() { cout << "自定义类模板Complex测试1: " << endl; test1(); cout << endl; cout << "自定义类模板Complex测试2: " << endl; test2(); }
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();}
accumlator.h
#include "date.h" #pragma once class Accumulator//将某个数值按日累加 { private: Date lastDate;//上次变更数值的时期 double value;//数值的当前值 double sum;//数值按日累加之和 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
#pragma once #include "date.h" #include "accumlator.h" #include <string> using namespace std; class Account { private: string id; double balance; static double total; protected: Account(const Date& date, const string& id); //记录一笔账，date为日期， amount为金额，desc为说明 void record(const Date& date, double amount, const string& desc); //报告错误信息 void error(const string& msg) const; public: const string& getId() { return id; } double getBalance() const { return balance; } static double getTotal() { return total; } //存入现金，date为日期，amount为金额，desc 为款项说明 virtual void deposit(const Date& date, double amount, const string& desc) = 0; //取出现金，date为日期，amount为金额，desc为款项说明 virtual void withdraw(const Date& date, double amount, const string& desc) = 0; //结算（计算利息、年费等），每月结算一次，date为结算日期 virtual void settle(const Date& date) = 0; //显示账户信息 virtual void show() const; }; class SavingsAccount : public Account { private: Accumulator acc; double rate; public: SavingsAccount(const Date& date, const string& id, double rate); double getRate() const { return rate; } void deposit(const Date& date, double amount, const string& desc); void withdraw(const Date& date, double amount, const 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 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 string& desc); void withdraw(const Date& date, double amount, const 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 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) { 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(); }
main.cpp
#include "account.h" #include <iostream> using namespace std; int main() { Date date(2008, 11, 1);//起始日期 //建立几个账户 SavingsAccount sal(date, "S3755217", 0.015); SavingsAccount sa2 (date, "02342342", 0.015); CreditAccount ca(date, "C5392394", 10000, 0.0005, 50); Account *accounts[]={&sal, &sa2, &ca}; const int n=sizeof(accounts)/sizeof(Account*); //账户总数 cout<<"(d)deposit(w)withdraw(s)show (c)change day (n)next month (e)exit"<<endl; char cmd; do{//显示日期和总金额 date.show(); cout<<"\tTotal: "<<Account::getTotal()<<"\tcommand>"; int index, day; double amount; string desc; cin>>cmd; switch (cmd) { case 'd'://存入现金 cin>>index>>amount; getline(cin,desc); accounts[index]->deposit(date, amount,desc); break; case 'w'://取出现金 cin>>index>>amount; getline(cin, desc); accounts[index]->withdraw(date, amount, desc); break; case 's'://查询各账户信息 for (int i=0;i<n; i++) { cout<<"["<<i<<"]"; accounts[i]->show(); cout<<endl; } break; case 'c'://改变日期 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'://进入下个月 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; }
