FunnyVALENTINE
D4C LOVE TRAIN
- Joined
- Apr 19, 2026
- Posts
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- 1,741
C++:
#include<iostream>
#include<vector>
#include<string>
#include<unordered_map>
#include<cctype>
#include<filesystem>
#include<algorithm>
#include<random>
#include<bitset>
#include<set>
#include<string_view>
#include<memory>
#include<cmath>
#include<cctype>
#include<fstream>
using std::vector;
using std::string;
using std::unordered_map;
using std::bitset;
using std::cout;
using std::cin;
using std::cerr;
class Book
{
public:
int id{};
string title{};
string author{};
int year{};
bool available{};
};
class Library
{
public:
vector<Book> collection =
{
{1,"The Hobbit","J.R.R. Tolkien", 1937, true},
{2,"1984", "George Orwell", 1949, true},
{3,"To Kill A Mockingbird", "Harper Lee", 1960, true},
{4, "The Great Gatsby", "F.Scott Fitzgerald", 1925,true},
{5, "Pride and Prejudice", "Jane Austen", 1813, true},
{6, "The Cather In The Rye", "J.D.Salinger", 1951, true},
{7, "The Alchemist", "Paulo Coelho", 1988, true},
{8, "The Da Vinci Code", "Dan Brown", 2003, true},
{9, "Clean Code", "Robert C Martin", 2008, true},
{10, "The Pragmatic Programmer", "Andrew Hunt & David Thomas", 1999, true}
};
};
bool userExists(const string& username);
class User
{
public:
string username{};
string password{};
bool existing_user{};
void input()
{
bool valid_name{};
do
{
existing_user = false;
valid_name = true;
cout << "Enter Your UserName: ";
std::getline(cin >> std::ws, username);
if (username.length() < 8 or username.length() > 20)
{
cout << "Username should not be less than 8 or more than 20 characters\n";
valid_name = false;
}
else if (userExists(username))
{
cout << "UserName already exists\n";
cout << "Choose a different username or If you have an account login to it\n";
cout << '\n';
valid_name = false;
existing_user = true;
return;
}
for (char c : username)
{
if (!std::isalnum(static_cast<unsigned char>(c)))
{
cout << "Username Should only contain Alphabets or numericals\n";
valid_name = false;
break;
}
}
} while (!valid_name);
bool valid_password{};
bool is_upper{};
bool is_digit{};
bool is_symbol{};
do
{
valid_password = true;
is_upper = false;
is_digit = false;
is_symbol = false;
cout << "Enter a Password Between 8-20 characters: ";
cin >> password;
if (password.length() < 8 or password.length() > 20)
{
cout << "Password should not be above 8 or 20 characters\n";
valid_password = false;
}
for (char c : password)
{
if (std::isupper(static_cast<unsigned char>(c)))
{
is_upper = true;
}
if (std::isdigit(static_cast<unsigned char>(c)))
{
is_digit = true;
}
if (std::ispunct(static_cast<unsigned char>(c)))
{
is_symbol = true;
}
}
if (!is_upper)
{
cout << "Password must contain alteast one uppercase letter\n";
valid_password = false;
}
if (!is_digit)
{
cout << "Password must contain alteast one digit\n";
valid_password = false;
}
if (!is_symbol)
{
cout << "Password must contain alteast one digit\n";
valid_password = false;
}
} while (!valid_password);
}
};
bool bookExists(int id);
int main()
{
User a;
int option{};
do
{
cout << "------------------MAIN MENU------------------\n";
cout << "1.Sign Up and Register to start borrowing books\n";
cout << "2.Login and Explore the Library to borrow and exchange books\n";
cout << "3.Exit\n";
cout << "Enter a number between 1-3 to begin operation: ";
cin >> option;
if (option == 1)
{
a.input();
if (!a.existing_user)
{
std::ofstream file{ "login.txt" };
if (!file)
{
cout << "File cannot be opened for writing\n";
}
file << "Username: " << a.username << '\n';
file << "Password: " << a.password << '\n';
file.close();
}
}
else if (option == 2)
{
int count{};
string s_ID{};
std::ifstream file3{ "borrowed_books.json" };
if (!file3)
{
cerr << "File will be created once you borrow your first book\n";
}
while (std::getline(file3, s_ID))
{
if (s_ID.find("\"id\"") != string::npos)
{
++count;
}
}
string stored_username{};
string stored_password{};
string Username{};
string Password{};
std::ifstream file{ "login.txt" };
if (!file)
{
cout << "File cannot be opened for reading\n";
}
cout << "Enter Your Username\n";
std::getline(cin >> std::ws, Username);
cout << "Enter Your Password\n";
cin >> Password;
while (std::getline(file, stored_username) && std::getline(file, stored_password))
{
if (stored_username == "Username: " + Username && stored_password == "Password: " + Password)
{
cout << "Login Successful\n";
bool logged_in{ true };
int choice{};
Library library{};
Book book;
while (logged_in)
{
cout << "----------MENU----------\n";
cout << "------------------------\n";
cout << "1.View Books\n";
cout << "2.Check Book Availability\n";
cout << "3.Search and Borrow Books\n";
cout << "4.Return Books\n";
cout << "5.To Exit\n";
cout << "Enter a Number between 1-4 to beging Operation: ";
cin >> choice;
switch (choice)
{
case 1:
{
for (const auto& book : library.collection)
{
cout << book.id << ". "
<< book.title
<< " by "
<< book.author
<< '\n';
}
break;
}
case 2:
{
for (const auto& book : library.collection)
{
cout << book.title << " by "
<< book.author << " is "
<< (book.available ? "Available" : "Not Available")
<< '\n';
}
break;
}
case 3:
{
int search_id{};
cout << "Enter the search Id of the book you want to borrow: ";
cin >> search_id;
auto it = std::find_if(library.collection.begin(), library.collection.end(), [search_id](const Book& book)
{
return book.id == search_id;
});
if (it == library.collection.end())
{
cout << "Book Not Found\n";
break;
}
if (count == 5)
{
cout << "You Already have 5 books\n";
break;
}
if (bookExists(it->id))
{
cout << "Book Already Exists In Your Collection!\n";
break;
}
if (it->available)
{
std::ofstream file{ "borrowed_books.json" };
file << "{\n";
file << " \"books\": [\n";
file << " {\n";
file << " \"id\": " << it->id << "," << '\n';
file << " \"title\": \"" << it->title << "\"" << "," << '\n';
file << " \"author\": \"" << it->author << "\"" << "," << '\n';
file << " \"year\": " << it->year << "," << '\n';
it->available = false;
file << " \"available\": " << std::boolalpha << it->available << '\n';
file << " },\n";
file << " ]\n";
file << "}\n";
file.close();
string line{};
vector<string>lines{};
char option{};
int num{ 4 };
std::ifstream file1{ "borrowed_books.json" };
while (std::getline(file1, line))
{
lines.push_back(line);
}
file1.close();
for (size_t i = 0; i < 4; ++i)
{
cout << "You can " << num << " more books continue ? : ";
cin >> option;
if (option == 'y' || option == 'Y')
{
for (size_t j = 0; j < lines.size(); ++j)
{
if (lines[j].find(']') != std::string::npos)
{
cout << "Enter the search Id of the book you want to borrow: ";
cin >> search_id;
auto it = std::find_if(library.collection.begin(), library.collection.end(), [search_id](const Book& book)
{
return book.id == search_id;
});
if (it == library.collection.end())
{
cout << "Book Not Found\n";
break;
}
it->available = false;
lines.insert(lines.begin() + j,
{
" {",
" \"id\": " + std::to_string(it->id) + ",",
" \"title\": \"" + it->title + "\",",
" \"author\": \"" + it->author + "\",",
" \"year\": " + std::to_string(it->year) + ",",
" \"available\": " + std::string(it->available ? "true" : "false"),
" },"
});
num -= 1;
std::ofstream file{ "borrowed_books.json" };
for (const auto& x : lines)
{
file << x << '\n';
}
break;
}
}
}
else
{
break;
}
}
}
else
{
cout << "Book Not Available\n";
}
break;
}
case 4:
{
char choiceYN{};
do
{
int book_ID{};
cout << "Enter the Id of the book you wanna return: ";
cin >> book_ID;
if (bookExists(book_ID))
{
vector<string>lines{};
string line{};
std::ifstream file{ "borrowed_books.json" };
while (std::getline(file, line))
{
lines.push_back(line);
}
for (size_t i = 1;i < lines.size(); ++i)
{
if (lines[i].find("\"id\"") != string::npos)
{
string stored_id = lines[i];
stored_id = stored_id.substr(12);
stored_id.erase(stored_id.size() - 1);
int new_stored_id = stoi(stored_id);
if (new_stored_id == book_ID)
{
lines.erase(lines.begin() + i - 1, lines.begin() + i + 6);
break;
}
}
}
std::ofstream file1{ "borrowed_books.json" };
for (const auto& x : lines)
{
file1 << x << '\n';
}
}
cout << "Do you want to continue ?? (q to quit): ";
cin >> choiceYN;
} while (choiceYN != 'q');
break;
}
case 5:
{
logged_in = false;
break;
}
default:
{
cout << "Invalid Option\n";
}
}
}
}
}
}
else if (option == 3)
{
cout << "See You Again\n";
}
}
while (option != 3);
return 0;
}
bool userExists(const string& username)
{
string stored_username{};
std::ifstream file{ "login.txt" };
if (!file)
{
cerr << "file cannot be opened for reading\n";
return false;
}
while (std::getline(file, stored_username))
{
if (stored_username == "Username: " + username)
{
cout << "Checking.....\n";
return true;
}
}
return false;
}
bool bookExists(int id)
{
string stored_id{};
std::ifstream file{ "borrowed_books.json" };
std::getline(file, stored_id);
std::getline(file, stored_id);
while (std::getline(file, stored_id))
{
if (stored_id.find("\"id\"") != std::string::npos)
{
stored_id = stored_id.substr(12);
stored_id.erase(stored_id.size() - 1);
int new_id = std::stoi(stored_id);
if (new_id == id)
{
cout << "Book Found\n";
return true;
}
}
}
return false;
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