- 来源
来自大一舍友C++大作业。该项目模拟了一个图书管理系统，涉及到用户对于书籍的查看、借阅与归还，管理员对于书籍相关信息的增删改查。 - 运行环境+运行结果的截图
运行环境：Windows 11 + Visual Studio 2022
main.cpp
#include<Windows.h>
#include "Account.h"
#include "libaray.h"
#include<iostream>
using std::cout;
using std::endl;
using std::cin;
void cls()
{system("cls");
}
int main()
{AccontList list;AllLibaray lib;auto reject = [&list, &lib](){string acc, pass, name;system("cls");cout << "\t注册" << endl;cout << "账户:";cin >> acc;cout << "密码:";cin >> pass;cout << "用户名:";cin >> name;while (!list.reje(acc, pass, name)){system("cls");cout << "\t注册账号,重复请重试\n账户:";cin >> acc;cout << "密码:";cin >> pass;cout << "用户名:";cin >> name;}cls();cout << " 注册成功" << endl;system("pause");};auto log = [&list, &lib](){cls();int i; string acc, pass;cout << "请选择以何种身份登录" << endl;cout << "1.管理员 2.用户 " << endl;cin >> i;cls();cout << "账户:";cin >> acc;cout << "密码:";cin >> pass;if (i == 1){if (!list.loginManager(acc, pass)){do{cls();cout << "账号密码错误，请重新输入\n";cout << "账户:";cin >> acc;cout << "密码:";cin >> pass;} while (!list.loginManager(acc, pass));}cls();cout << "登陆成功,欢迎管理员使用" << endl;return -1;}else{int i;if ((i = list.loginUser(acc, pass)) != -1){cls();cout << "登陆成功,欢迎用户" << list[i].getName()<< "使用" << endl;return i;}else{do{cls();cout << "账号密码错误，请重新输入\n";cout << "账户:";cin >> acc;cout << "密码:";cin >> pass;} while ((i = list.loginUser(acc, pass)) == -1);cls();cout << "登陆成功,欢迎用户" << list[i].getName()<< endl;return i;}}};auto manage = [&list, &lib](){int j = 0;lib.choice();system("pause");while (true){cls();cout << "请根据提示输入数字以进行操作" << endl;cout << "1.重新选择书籍库 2.修改现有书籍数量 3.增添新的书籍" << endl;cout << "4.删除书籍 5.显示本书籍库中所有书籍 6.查找书籍" << endl;cout << "7.退出登录" << endl;cin >> j;cls();switch (j){case 1:lib.choice();break;case 2:lib.add();break;case 3:lib.addnew();break;case 4:lib.erase();break;case 5:lib.showAll();break;case 6:cout << "请选择查找书籍的方式:\n1.根据书籍id精确搜索 2.模糊搜索" << endl;cin >> j;if (j == 2)lib.search();else lib.searchBook();break;case 7:goto endManage;break;}system("pause");}endManage:cls();};auto use = [&list, &lib](User& user){if (user.getFine() != 0){cout << "您有" << user.getFine() << "本书籍逾期，请尽快还书" << endl;system("pause");cls();}int j = 0;lib.choice();system("pause");while (true){cls();cout << "请根据提示输入数字以进行操作" << endl;cout << "1.重新选择书籍库 2.借阅书籍 3.借书管理" << endl;cout << "4.显示本书籍库中所有书籍 5.查找书籍 6.退出登录" << endl;cin >> j;cls();switch (j){case 1:lib.choice();break;case 2:user.push_back(lib.lend());break;case 3:cout << "请根据提示输入数字以进行操作\n1.查看借阅信息 2.还书" << endl;cin >> j;cls();if (j == 1){user.showBorrow();}else if (j == 2){bool p = true;Borrow& borrow = user.returnBook(p);if (p){lib.returnBook(borrow);cout << "还书成功" << endl;}}break;case 4:lib.showAll();break;case 5:cout << "请选择查找书籍的方式:\n1.根据书籍id精确搜索 2.模糊搜索" << endl;cin >> j;if (j == 2)lib.search();else lib.searchBook();break;break;case 6:goto endUse;break;}system("pause");}endUse:cls();};int i = 0; bool islog = false;while (true){cls();cout << " 欢迎使用图书馆管理系统 " << endl;cout << "请根据提示输入数字以进行操作" << endl;cout << " 1.登录 2.注册 3.退出 " << endl;cin >> i;switch (i){case 3:goto end;break;case 2:reject();break;case 1:i = log(); islog = true;break;}if (islog){if (i == -1){manage();islog = false;}else{use(list[i]);islog = false;}}}
end:cls();cout << "感谢您的使用！再见" << endl;
}
Borrow.h
#pragma once
#include<string>
#include<chrono>
#include <fstream>
#include<iostream>
#include<iomanip>
class Borrow
{std::string ID;std::string name;bool isreturn = false;std::chrono::system_clock::time_point begin, end;std::chrono::system_clock::time_point should;
public:Borrow() = default;Borrow(std::string ID, std::string name, int day = 60);void returnbook();void show();bool isReturn();bool overtime();std::string getID();void is(bool is);void change(std::chrono::system_clock::time_point a, std::chrono::system_clock::time_point b, std::chrono::system_clock::time_point c);std::tuple<std::chrono::system_clock::time_point, std::chrono::system_clock::time_point, std::chrono::system_clock::time_point>write();bool noemp() const;friend std::ofstream& operator<<(std::ofstream& out, const Borrow& aim);
};Borrow.cpp
#include "Borrow.h"
Borrow::Borrow(std::string ID, std::string name, int day):ID(ID), name(name), begin(std::chrono::system_clock::now() + std::chrono::hours(8)-std::chrono::days(60)), should(begin + std::chrono::days(day))
{}
void Borrow::returnbook()
{end = std::chrono::system_clock::now() + std::chrono::hours(8);isreturn = true;
}
void Borrow::show()
{std::cout << "书籍编号:" << std::left << std::setw(10) << ID << " 书名:"<< std::left << std::setw(10) << name << "借阅时间:" << begin << std::endl;if (isreturn){std::cout << "书籍状态:已归还" << "\t 还书时间:" << end << std::endl;}else{std::cout << "书籍状态:未归还" << "\t 应还时间:" << should << std::endl;}}
bool Borrow::isReturn()
{return isreturn;
}
bool Borrow::overtime()
{return std::chrono::system_clock::now() > should;
}
std::string Borrow::getID()
{return ID;
}
void Borrow::is(bool is)
{isreturn = is;
}
void Borrow::change(std::chrono::system_clock::time_point a, std::chrono::system_clock::time_point b, std::chrono::system_clock::time_point c)
{begin = a; end = b; should = c;
}
std::tuple<std::chrono::system_clock::time_point, std::chrono::system_clock::time_point, std::chrono::system_clock::time_point> Borrow::write()
{return std::tuple<std::chrono::system_clock::time_point, std::chrono::system_clock::time_point,std::chrono::system_clock::time_point>(begin, end, should);
}
bool Borrow::noemp() const
{return !ID.empty();
}
std::ofstream& operator<<(std::ofstream& out, const Borrow& aim)
{out << aim.ID << ' ' << aim.name << ' ' << aim.isreturn;return out;
}Account.h
#pragma once
#include <Windows.h>
#include "Borrow.h"
#include <string>
#include <fstream>
using namespace std;
class Account
{
protected:string account, password, name;
public:Account(string account, string password, string name);~Account();bool log(const string& account, const string& password);string getName();
};
class User :public Account
{
private:size_t fine;vector<Borrow> list;
public:User(string account, string password, string name);~User();string& getAccount();size_t getFine();void push_back(const Borrow& b);void showBorrow();Borrow& returnBook(bool& p);friend ofstream& operator<<(ofstream& out, const User& aim);
};
class AccontList
{Account manager;vector<User> user;
public:AccontList();~AccontList();int loginUser(const string& account, const string& password);bool loginManager(const string& account, const string& password);Account& manage();User& operator[](int i);bool reje(const string& account, const string& password, const string& name);
};Account.cpp
#include "Account.h"Account::Account(string account, string password, string name):account(account),password(password),name(name)
{
}Account::~Account()
{
}bool Account::log(const string& account, const string& password)
{return this->account == account && this->password == password;
}string Account::getName()
{return name;
}User::User(string account, string password, string name):Account(account, password, name),fine(0)
{ifstream in(account + ".txt");ifstream inb(account + ".dat", std::ios::in | std::ios::binary);if (in.good()){string ID, BookName; bool is;while (!in.eof()){in >> ID >> BookName >> is;Borrow boo(ID, BookName);boo.is(is);std::chrono::system_clock::time_point a, b, c;inb.read(reinterpret_cast<char*>(&a), sizeof(std::chrono::system_clock::time_point));inb.read(reinterpret_cast<char*>(&b), sizeof(std::chrono::system_clock::time_point));inb.read(reinterpret_cast<char*>(&c), sizeof(std::chrono::system_clock::time_point));boo.change(a, b, c);list.push_back(boo);}}if (!list.empty()){for (auto& fff : list){if (!fff.isReturn()&&fff.overtime()){fine += 1;}}}
}User::~User()
{if (!list.empty()){ofstream out(account + ".txt");ofstream outb(account + ".dat", std::ios::out | std::ios::binary);for (int i = 0; i < list.size(); i++){out << list[i];if (i < list.size() - 1){out << '\n';}auto tup = list[i].write();std::chrono::system_clock::time_point a = std::get<0>(tup), b = std::get<1>(tup), c = std::get<2>(tup);outb.write(reinterpret_cast<char*>(&a), sizeof(std::chrono::system_clock::time_point));outb.write(reinterpret_cast<char*>(&b), sizeof(std::chrono::system_clock::time_point));outb.write(reinterpret_cast<char*>(&c), sizeof(std::chrono::system_clock::time_point));}}
}string& User::getAccount()
{return account;
}size_t User::getFine()
{return fine;
}void User::showBorrow()
{if (list.empty()){cout << "尚无借书记录" << endl;}for (auto& borrow : list){borrow.show();}
}Borrow& User::returnBook(bool& p)
{int j;for (int i = 0; i < list.size(); ++i){cout <<"编号:" << i << '.';list[i].show();}cout << "请输入要归还的书籍所对应的借书记录编号" << endl;cin >> j;system("cls");if (j >= list.size() || j < 0){cout << "没有此借书记录" << endl;Borrow a;p = false;return a;}else if (list[j].isReturn()){cout << "书籍已经被归还" << endl;Borrow a;p = false;return a;}return list[j];}void User::push_back(const Borrow& b)
{if(b.noemp())list.push_back(b);
}AccontList::AccontList():manager("mashiro","0721","管理员")
{ifstream in("user.txt");while (!in.eof()){string a, b, c;in >> a >> b >> c ;user.emplace_back(a, b, c);}
}AccontList::~AccontList()
{ofstream out("user.txt");for (int i = 0; i < user.size(); i++){out << user[i];if (i < user.size() - 1){out << '\n';}}
}bool AccontList::loginManager(const string& account, const string& password)
{return manager.log(account, password);
}int AccontList::loginUser(const string& account, const string& password)
{for (int i = 0; i < user.size(); i++){if (user[i].log(account, password)){return i;}}return -1;
}User& AccontList::operator[](int i)
{return user[i];
}
bool AccontList::reje(const string& account, const string& password, const string& name)
{for (auto& a : user){if (a.getAccount() == account){return false;}}user.emplace_back(account, password, name);return true;
}
Account& AccontList::manage()
{return manager;
}
ofstream& operator<<(ofstream& out, const User& aim)
{out << aim.account << ' ' << aim.password << ' ' << aim.name ;return out;
}Books.h
#pragma once
#include <iostream>
#include <string>
#include<iomanip>
#include<vector>
#include<algorithm>
#include<fstream>
using namespace std;
class Books {
protected:string id;string name;double price;string author;string publishing;int inventory;float totalmark = 0;size_t totalman = 0;
public:Books(string a, string b, double c, string d, string e, int f);~Books();Books();string get_id();string get_name();double get_price();string get_author();string get_publishing();int get_inventory();float get_aver_mark()const;float get_totalmark();int get_totalman();virtual void ShowMe();friend ofstream& operator<<(ofstream& out, const Books& a);friend ifstream& operator>>(ifstream& in, Books& a);bool Search(const string& a);friend Books& operator+(Books& ,int b);friend Books& operator-(Books& , int b);Books& operator++();const Books operator++(int);Books& operator--();const Books operator--(int);void evaluate();void dis_evalution();
};
class ScienceBook :public Books {
public:ScienceBook(string id, string name, double price, string author, string publishing, int inventory);ScienceBook() = default;
};
class SocialBook :public Books {
public:SocialBook(string id, string name, double price, string author, string publishing, int inventory);SocialBook() = default;
};
class ForeignBook :public Books {
protected:string Language;
public:virtual void ShowMe();ForeignBook(string id, string name, double price, string author, string publishing, int inventory, string language);friend ofstream& operator<<(ofstream& out, const ForeignBook& a);friend ifstream& operator>>(ifstream& in, ForeignBook& a);void evaluate();void dis_evalution();ForeignBook() = default;
};
Books.cpp
#include"Books.h"
Books::Books(string a, string b, double c, string d, string e, int f):id(a), name(b), price(c), author(d), publishing(e), inventory(f) {}
Books::~Books(){}
Books::Books(){}
ScienceBook::ScienceBook(string id, string name, double price, string author, string publishing, int inventory):Books(id, name, price, author, publishing, inventory) {}
SocialBook::SocialBook(string id, string name, double price, string author, string publishing, int inventory):Books(id, name, price, author, publishing, inventory) {}
ForeignBook::ForeignBook(string id, string name, double price, string author, string publishing, int inventory, string language):Books(id, name, price, author, publishing, inventory), Language(language) {}
void ForeignBook::evaluate()
{string evalution;float a;ofstream eva(name + ".txt", ios::ate | ios::app);cout << "请输入你对该书的评分" << endl;while (true){cin >> a;if (a >= 0 && a <= 10.0){eva << a << " ";totalman++;totalmark = totalmark + a;break;}elsecout << "评分应为0-10请重新输入" << endl;}cout << "请输入你对这本书的评价" << endl;cin >> evalution;eva << evalution << endl;
}
void ForeignBook::dis_evalution()
{ifstream fin(name + ".txt", ios::in);vector<string>a;vector<float>b;string evalu;float score;while (fin >> score && fin >> evalu){b.emplace_back(score);a.emplace_back(evalu);}for (int i = 0; i < a.size(); i++){cout << "评分：" << b[i] << " ";cout << "评价：" << a[i] << endl;}
}
ofstream& operator<<(ofstream& out, const Books& a)
{out << a.id << " " << a.name << " " << a.price << " " << a.author << " " << a.publishing<< " " << a.inventory << " "<<a.totalmark<<" "<<a.totalman;return out;
}
ifstream& operator >>(ifstream& in, Books& a)
{in >> a.id >> a.name >> a.price >> a.author >> a.publishing >> a.inventory>>a.totalmark>>a.totalman;return in;
}
ofstream& operator<<(ofstream& out, const ForeignBook& a)
{out << a.id << " " << a.name << " " << a.price << " " << a.author << " " << a.publishing <<" " << a.inventory << " " << a.Language <<" "<<a.totalmark<<" "<<a.totalman;return out;
}
ifstream& operator >>(ifstream& in, ForeignBook& a)
{in >> a.id >> a.name >> a.price >> a.author >> a.publishing >> a.inventory>>a.Language >> a.totalmark >> a.totalman;return in;
}
Books& operator+(Books& a,int b)
{a.inventory = a.inventory + b;return a;
}Books& operator-(Books& a, int b)
{a.inventory = a.inventory - b;return a;
}
string Books::get_id(){ return id; }
string Books::get_name(){ return name; }
double Books::get_price(){ return price; }
string Books::get_author() { return author; }
string Books::get_publishing() { return publishing; }
int Books::get_inventory() { return inventory; }
float Books::get_totalmark() { return totalmark; }
int Books::get_totalman() { return totalman; }
float Books::get_aver_mark()const { return totalmark / totalman; }
void Books::ShowMe(){cout << "编号：" << std::left << setw(10) << id << " " << "书名：" << std::left << setw(10) << name << " " << "价格：" <<std::left << setw(8) << setprecision(4) << price << " " << "作者：" << std::left << setw(10) << author << " " << "出版社：" <<std::left << setw(10) << publishing << " " << "库存：" << std::left << setw(5) << inventory<< " ";if (totalman == 0){cout << "暂无评分" << endl;}else{cout<< "评分：" << setprecision(2) << get_aver_mark() << endl;}
}
void ForeignBook::ShowMe() {cout << "编号：" << std::left << setw(10) << id << " " << "书名：" << std::left << setw(10) << name << " " << "价格：" <<std::left << setw(8) << setprecision(4) << price << " " << "作者：" << std::left << setw(10) << author << " " << "出版社：" <<std::left << setw(10) << publishing<< " " << std::left << setw(5) << "语言：" << Language << " " << "库存：" << std::left << setw(5) << inventory;if (totalman == 0){cout << "暂无评分" << endl;}else{cout <<"评分："<< setprecision(2) << get_aver_mark() << endl;}
}
bool Books::Search(const string& a)
{return id.find(a) != -1 || name.find(a) != -1 || author.find(a) != -1 || publishing.find(a) != -1;
}
Books& Books::operator++()
{this->inventory++;return *this;
}
const Books Books::operator++(int)
{Books a;this->inventory++;return a;
}Books& Books::operator--()
{this->inventory--;return *this;
}const Books Books::operator--(int)
{Books a;this->inventory--;return a;
}void Books::evaluate()
{string evalution;float a;ofstream eva(name + ".txt", ios::ate | ios::app);cout << "请输入你对该书的评分" << endl;while (true){cin >> a;if (a >= 0 && a <= 10.0){totalman++;totalmark=totalmark + a;break;}elsecout << "评分应为0-10请重新输入" << endl;}char YON;cout << "是否要为这本书写一段评价(Y/N)" << endl;cin >> YON;if(YON=='Y'){cout << "请输入你对这本书的评价" << endl;cin >> evalution;eva << evalution << endl;}
}
void Books::dis_evalution()
{ifstream fin(name + ".txt", ios::in);if (fin.good()){vector<string>a;string evalu;while (fin >> evalu){a.push_back(evalu);}if (!a.empty()){for (int i = 0; i < a.size(); i++){cout << "评价：" << a[i] << endl;}}}
}
libarary.h
#pragma once
#include<Windows.h>
#include"Books.h"
#include"Borrow.h"
#include<vector>template<typename T,int S>
class Libaray
{
private:std::vector<T> list;
public:Libaray(){string a;if (S == 1){a = "1";}else if(S==2){a="2";}else if (S == 3){a="3";}std::ifstream file(a + "book.txt");while (!file.eof()){T book;file >> book;list.push_back(book);}}//从文件中读取Books的信息并放入list~Libaray(){string a;if (S == 1){a="1";}else if (S == 2){a="2";}else if (S == 3){a="3";}std::ofstream file(a+"book.txt");for (int i = 0; i < list.size(); i++){file << list[i];if (i < list.size() - 1){file << "\n";}}}//将list中的book的信息传入文件T& operator[](int i){return list[i];}Borrow lend(){string id;int day;cout << "请输入您想寻找的书籍ID:";cin >> id;for (auto it = list.begin(); it != list.end(); ++it){if (it->get_id() == id && it->get_inventory() > 0){cout << "请输入您想借阅的天数：";cin >> day;--*it;cout << "该书籍已被成功借阅" << endl;return Borrow(id, it->get_name(), day);}}cout << "您寻找的书籍未满足可借阅条件" << endl;return Borrow();}void add(){string id;int addnum;cout << "请输入您想要增添库存的书籍ID：";cin >> id;cout << endl;for (auto it = list.begin(); it != list.end(); ++it){if (it->get_id() == id){cout << "请输入您想要增添的数量：";cin >> addnum;cout << endl;*it + addnum;cout << "成功添加到库存当中";return;}}std::cout << "没有在书库中找到对应的书籍" << std::endl;}void addnew(string id,string name,double price,string author,string publishing,int inventory){for (auto it = list.begin(); it != list.end(); it++){if (it->get_id() == id){std::cout << "该书籍ID与书库中已有的书籍的ID重合" << std::endl;return;}if (it->get_name() == name){cout << "该书籍的书名与书库中已有的书籍书名重合" << endl;return;}}list.push_back(T(id, name,price,author, publishing,inventory));cout << "该书籍已被成功添入书库" << endl;}void addnew(string id, string name, double price, string author, string publishing, int inventory,string language){for (auto it = list.begin(); it != list.end(); it++){if (it->get_id() == id){std::cout << "该书籍ID与书库中已有的书籍的ID重合" << std::endl;return;}if (it->get_name() == name){cout << "该书籍的书名与书库中已有的书籍书名重合" << endl;return;}}list.push_back(T(id, name, price, author, publishing, inventory,language));cout << "该书籍已被成功添入书库" << endl;}void searchBook(){string id; char i;cout << "请输入您想要搜索的书籍ID：";cin >> id;cout << endl;system("cls");for (T& book : list) {if (book.get_id() == id) {book.ShowMe();cout << "\n是否要进一步查看书籍信息(T/F)" << endl;cin >> i;if (i == 'T'){system("cls");cout << "1.查看书籍评价 2.评价书籍" << endl;cin >> i;if (i == '1'){book.dis_evalution();}else if (i == '2'){book.evaluate();}}return;}}std::cout << "未找到ID为" << id << "的书籍。" << std::endl;}void search(){bool find = false;string aim;cout << "请输入您想要搜索的书籍拥有的信息：";cin >> aim;cout << endl;system("cls");for (T& book : list){if (book.Search(aim)){book.ShowMe();find = true;}}if (!find){cout << "提供信息：" << aim << endl << "没有找到符合条件的书籍" << endl;}}void erase(){string id;cout << "请输入您想要删除的书籍ID：";cin >> id;cout << endl;for (auto it = list.begin(); it != list.end(); ++it){if (it->get_name() == id) {system("cls");std::cout << "已删除书籍: " << it->get_name() << std::endl;list.erase(it);return;}}system("cls");std::cout << "未找到ID为" << id << "的书籍。" << std::endl;}void showAll(){for (auto& book : list){book.ShowMe();}}void returnBook(Borrow& borrow){for (T& book : list) {if (book.get_id() == borrow.getID()) {++book;borrow.returnbook();return;}}}
};class AllLibaray {
private:Libaray<ScienceBook, 1>a;Libaray<SocialBook, 2>b;Libaray<ForeignBook, 3>c;int i;
public:void choice();void addnew();Borrow lend();void add();void searchBook();void search();void erase();void showAll();void returnBook(Borrow& borrow);
};
libarary.cpp
#include "libaray.h"
void AllLibaray::choice()
{cout << "以下是图书馆书籍库的书籍类型：\n";cout << "1.科学类书籍库\t2.社会类书籍库\t3.外语类书籍库\n";cout << "请输入您想要进入的书籍库：";cin >> i;system("cls");if (i == 1){cout << "您将进入科学类书籍库\n";}else if (i == 2){cout << "您将进入社会类书籍库\n";}else if (i == 3){cout << "您将进入外语类书籍库\n";}}
void AllLibaray::addnew()
{string id, name, author, publishing, language;int inventory;float price;if (i == 1){cout << "请输入您想要添加的书籍信息：\n";cout << "书籍ID：";cin >> id;cout << endl << "书籍名字：";cin >> name;cout << endl << "书籍价格：";cin >> price;cout << endl << "书记作者：";cin >> author;cout << endl << "书籍出版社：";cin >> publishing;cout << endl << "添入书库的库存数量：";cin >> inventory;a.addnew(id, name, price, author, publishing, inventory);}else if (i == 2){cout << "请输入您想要添加的书籍信息：\n";cout << "书籍ID：";cin >> id;cout << endl << "书籍名字：";cin >> name;cout << endl << "书籍价格：";cin >> price;cout << endl << "书记作者：";cin >> author;cout << endl << "书籍出版社：";cin >> publishing;cout << endl << "添入书库的库存数量：";cin >> inventory;b.addnew(id, name, price, author, publishing, inventory);}else if (i == 3){cout << "请输入您想要添加的书籍信息：\n";cout << "书籍ID：";cin >> id;cout << endl << "书籍名字：";cin >> name;cout << endl << "书籍价格：";cin >> price;cout << endl << "书记作者：";cin >> author;cout << endl << "书籍出版社：";cin >> publishing;cout << endl << "添入书库的库存数量：";cin >> inventory;cout << endl << "该外刊的语言种类：";cin >> language;c.addnew(id, name, price, author, publishing, inventory, language);}
}
Borrow AllLibaray::lend()
{switch (i){case 1:a.showAll(); return a.lend();break;case 2:b.showAll(); return b.lend();break;case 3:c.showAll(); return c.lend();break;}
}
void AllLibaray::add()
{switch (i){case 1:a.showAll(); a.add();break;case 2:b.showAll(); b.add();break;case 3:c.showAll(); c.add();break;}
}
void AllLibaray::searchBook()
{switch (i){case 1: a.searchBook();break;case 2: b.searchBook();break;case 3: c.searchBook();break;}
}
void AllLibaray::search()
{switch (i){case 1: a.search();break;case 2: b.search();break;case 3: c.search();break;}
}
void AllLibaray::erase()
{switch (i){case 1:a.showAll(); a.erase();break;case 2:b.showAll(); b.erase();break;case 3:c.showAll(); c.erase();break;}
}
void AllLibaray::showAll()
{switch (i){case 1: a.showAll();break;case 2: b.showAll();break;case 3: c.showAll();break;}
}void AllLibaray::returnBook(Borrow& borrow)
{a.returnBook(borrow);b.returnBook(borrow);c.returnBook(borrow);
}-
代码中使用了goto语句，破坏了整体的结构性，重新优化结构以避免使用goto语句
-
进入登录或注册操作后，不成功登录或注册无法回到选择登录还是注册界面，如果用户误操作，就必须重新启动程序
-
用户在借书后，显示借书时间与实际时间不符
-
用户在精准查询时，可以输入，对于该书籍的评价，但在模糊搜寻后，若想要评价某一书籍，必须重新进入查询的精准查询功能，步骤繁琐
-
删除数据功能有误
-
删除书籍后，曾有对于书籍评价的文件还会存在，不会一并被删除
-
还书时，若书籍被删除，会出bug
-
输出的文字存在部分语法错误
- 新代码附上
代码中使用了goto语句，破坏了整体的结构性，重新优化结构以避免使用goto语句
auto manage = [&list, &lib](){int j = 0;lib.choice();system("pause");while (true){system("cls");cout << "请根据提示输入数字以进行操作" << endl;cout << "1.重新选择书籍库 2.修改现有书籍数量 3.增添新的书籍" << endl;cout << "4.删除书籍 5.显示本书籍库中所有书籍 6.查找书籍" << endl;cout << "7.退出登录" << endl;cin >> j;system("cls");switch (j){case 1:lib.choice();break;case 2:lib.add();break;case 3:lib.addnew();break;case 4:lib.erase();break;case 5:lib.showAll();break;case 6:cout << "请选择查找书籍的方式:\n1.根据书籍id精确搜索 2.模糊搜索" << endl;cin >> j;if (j == 2)lib.search();else lib.searchBook();break;}if (j == 7){break;}system("pause");}system("cls");};auto use = [&list, &lib](User& user){if (user.getFine() != 0){cout << "您有" << user.getFine() << "本书籍逾期，请尽快还书" << endl;system("pause");system("cls");}int j = 0;lib.choice();system("pause");while (true){system("cls");cout << "请根据提示输入数字以进行操作" << endl;cout << "1.重新选择书籍库 2.借阅书籍 3.借书管理" << endl;cout << "4.显示本书籍库中所有书籍 5.查找书籍 6.退出登录" << endl;cin >> j;system("cls");switch (j){case 1:lib.choice();break;case 2:user.push_back(lib.lend());break;case 3:cout << "请根据提示输入数字以进行操作\n1.查看借阅信息 2.还书" << endl;cin >> j;system("cls");if (j == 1){user.showBorrow();}else if (j == 2){if (user.hasBorrow()){bool p = true;Borrow& borrow = user.returnBook(p);if (p){lib.returnBook(borrow);cout << "还书成功" << endl;}}else{cout << "尚无借书记录" << endl;system("pause");}}break;case 4:lib.showAll();break;case 5:cout << "请选择查找书籍的方式:\n1.根据书籍id精确搜索 2.模糊搜索" << endl;cin >> j;if (j == 2)lib.search();else lib.searchBook();break;}if (j == 6){break;}system("pause");}system("cls");};while (true){system("cls");cout << " 欢迎使用图书馆管理系统 " << endl;cout << "请根据提示输入数字以进行操作" << endl;cout << " 1.登录 2.注册 3.退出 " << endl;cin >> i;if (i == 1){i = log();if (i == -1){manage();}else if (i == -2){}else{use(list[i]);}}else if (i == 2){reject();}else{break;}}进入登录或注册操作后，不成功登录或注册无法回到选择登录还是注册界面，如果用户误操作，就必须重新启动程序
auto reject = [&list, &lib](){string acc, pass, name;system("cls");cout << "\t注册(若想返回初始界面请于“账户：”输入return)" << endl;cout << "账户:";cin >> acc;if (acc == "return"){return;}cout << "密码:";cin >> pass;cout << "用户名:";cin >> name;while (!list.reje(acc, pass, name)){system("cls");cout << "\t注册账号重复,请重试(若想返回初始界面请于“账户：”输入return)\n账户:";cin >> acc;if (acc == "return"){return;}cout << "密码:";cin >> pass;cout << "用户名:";cin >> name;}system("cls");cout << " 注册成功" << endl;system("pause");};auto log = [&list, &lib](){system("cls");int i; string acc, pass;cout << "请选择以何种身份登录" << endl;cout << "1.管理员 2.用户 " << endl;cin >> i;system("cls");cout << "(若想返回初始界面请于“账户：”输入return)\n账户:";cin >> acc;if (acc == "return"){return -2;}cout << "密码:";cin >> pass;if (i == 1){if (!list.loginManager(acc, pass)){do{system("cls");cout << "账号密码错误，请重新输入(若想返回初始界面请于“账户：”输入return)\n";cout << "账户:";cin >> acc;if (acc == "return"){return -2;}cout << "密码:";cin >> pass;} while (!list.loginManager(acc, pass));}system("cls");cout << "登陆成功,欢迎管理员使用" << endl;return -1;}else{int i;if ((i = list.loginUser(acc, pass)) != -1){system("cls");cout << "登陆成功,欢迎用户" << list[i].getName()<< "使用" << endl;return i;}else{do{system("cls");cout << "账号密码错误，请重新输入(若想返回初始界面请于“账户：”输入return)\n";cout << "账户:";cin >> acc;if (acc == "return"){return -2;}cout << "密码:";cin >> pass;} while ((i = list.loginUser(acc, pass)) == -1);system("cls");cout << "登陆成功,欢迎用户" << list[i].getName()<< endl;return i;}}};
用户在借书后所记录的借书时间与当前时间不符
Borrow::Borrow(std::string ID, std::string name, int day):ID(ID), name(name), begin(std::chrono::system_clock::now() + std::chrono::hours(8)), should(begin + std::chrono::days(day))
{}
用户在精准查询时，可以输入，对于该书籍的评价，但在模糊搜寻后，若想要评价某一书籍，必须重新进入查询的精准查询功能，步骤繁琐
void search(){bool find = false;string aim;cout << "请输入您想要搜索的书籍拥有的信息：";cin >> aim;cout << endl;system("cls");for (T& book : list){if (book.Search(aim)){book.ShowMe();find = true;}}if (!find){cout << "提供信息：" << aim << endl << "没有找到符合条件的书籍" << endl;}else{char userDicision;cout << "\n是否要进一步查看书籍信息(T/F)" << endl;cin >> userDicision;if (userDicision == 'T'){while (true){system("cls");cout << "请输入您想要进一步查看的书籍ID：" << endl;string id;cin >> id;for (T& book : list){if (book.get_id() == id){cout << "1.查看书籍评价 2.评价书籍" << endl;cin >> userDicision;if (userDicision == '1'){book.dis_evalution();}else if (userDicision == '2'){book.evaluate();}return;}}cout << "未找到ID为" << id << "的书籍。是否要从新输入(T/F)" << endl;cin >> userDicision;if (userDicision == 'F'){return;}}}}}
删除数据功能有误
void erase()
{string id;cout << "请输入您想要删除的书籍ID：";cin >> id;cout << endl;for (auto it = list.begin(); it != list.end(); ++it){if (it->get_id() == id) {system("cls");std::cout << "已删除书籍: " << it->get_name() << std::endl;std::filesystem::path deleteFileName = it->get_name() + ".txt";if (std::filesystem::exists(deleteFileName)){std::filesystem::remove(deleteFileName);}list.erase(it);return;}}system("cls");std::cout << "未找到ID为" << id << "的书籍。" << std::endl;
}
删除书籍后，曾有对于书籍评价的文件还会存在，不会一并被删除
std::filesystem::path deleteFileName = it->get_name() + ".txt";
if (std::filesystem::exists(deleteFileName))
{std::filesystem::remove(deleteFileName);
}
还书时，若书籍被删除，会出bug
void returnBook(Borrow& borrow){for (T& book : list) {if (book.get_id() == borrow.getID()) {++book;break;}}borrow.returnbook();return;}
输出的文字存在部分语法错误
cout << "\t注册账号重复,请重试(若想返回初始界面请于“账户：”输入return)\n账户:";
- 总结
本次逆向二次开发，难点在于理解其他人写的代码。Borrow类里超级长的返回值和复杂的STL库函数调用理解起来非常困难。此外，在阅读代码时，没有注释很难理解这段代码的作用是什么。例如，Borrow类构造函数中第二个成员变量赋值中给std::chrono::system_clock::now()加上了两个值，非常难以理解原因，在翻阅了STL库标准文档后才发现std::chrono::system_clock::now()是零时区的时间，换算成中国时间要加八个小时（ + std::chrono::hours(8)），而第二个值却是被错误的加上的，会导致程序出bug。
意识到了在开发过程中，注释和开发文档的重要性。
