code

#include <iostream>
#include <string>
using namespace std;

const int MAX_BOOKS = 100;

struct Book {
    int id;
    string title;
    string author;
    bool available;
    string borrower;
};

Book library[MAX_BOOKS];
int numBooks = 0;

void addBook();
void searchBook();
void issueBook();
void returnBook();
void listBooks();
void deleteBook();
void sortBooksByID();

int main() {
    int choice;
    do {
        cout << "\n===== Library Management System Menu =====\n";
        cout << "1. Add a new book\n";
        cout << "2. Search for a book\n";
        cout << "3. Issue a book\n";
        cout << "4. Return a book\n";
        cout << "5. List all books\n";
        cout << "6. Delete a book\n";
        cout << "7. Exit\n";
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case 1: addBook(); break;
            case 2: searchBook(); break;
            case 3: issueBook(); break;
            case 4: returnBook(); break;
            case 5: listBooks(); break;
            case 6: deleteBook(); break;
            case 7: cout << "Exiting program.\n"; break;
            default: cout << "Invalid choice. Please enter a number between 1 and 7.\n"; break;
        }
    } while (choice != 7);
    return 0;
}

void addBook() {
    if (numBooks < MAX_BOOKS) {
        cout << "\nEnter book details:\n";
        cout << "ID: ";
        cin >> library[numBooks].id;
        cout << "Title: ";
        cin.ignore();
        getline(cin, library[numBooks].title);
        cout << "Author: ";
        getline(cin, library[numBooks].author);
        library[numBooks].available = true;
        numBooks++;
        sortBooksByID();
        cout << "Book added successfully!\n";
    } else {
        cout << "Cannot add more books. Library is full.\n";
    }
}

void sortBooksByID() {
    for (int i = 1; i < numBooks; ++i) {
        Book key = library[i];
        int j = i - 1;
        while (j >= 0 && library[j].id > key.id) {
            library[j + 1] = library[j];
            j = j - 1;
        }
        library[j + 1] = key;
    }
}

void searchBook() {
    int searchId;
    string searchTitle;
    bool found = false;
    cout << "\nSearch by:\n";
    cout << "1. ID\n";
    cout << "2. Title\n";
    cout << "Enter your choice: ";
    int choice;
    cin >> choice;

    switch (choice) {
        case 1:
            cout << "Enter ID to search: ";
            cin >> searchId;
            for (int i = 0; i < numBooks; ++i) {
                if (library[i].id == searchId) {
                    cout << "Book found:\n";
                    cout << "ID: " << library[i].id << endl;
                    cout << "Title: " << library[i].title << endl;
                    cout << "Author: " << library[i].author << endl;
                    cout << "Status: " << (library[i].available ? "Available" : "Issued") << endl;
                    if (!library[i].available)
                        cout << "Borrower: " << library[i].borrower << endl;
                    found = true;
                    break;
                }
            }
            break;
        case 2:
            cout << "Enter title to search: ";
            cin.ignore();
            getline(cin, searchTitle);
            for (int i = 0; i < numBooks; ++i) {
                if (library[i].title == searchTitle) {
                    cout << "Book found:\n";
                    cout << "ID: " << library[i].id << endl;
                    cout << "Title: " << library[i].title << endl;
                    cout << "Author: " << library[i].author << endl;
                    cout << "Status: " << (library[i].available ? "Available" : "Issued") << endl;
                    if (!library[i].available)
                        cout << "Borrower: " << library[i].borrower << endl;
                    found = true;
                    break;
                }
            }
            break;
        default:
            cout << "Invalid choice.\n";
            break;
    }
    if (!found) cout << "Book not found.\n";
}

void issueBook() {
    int issueId;
    bool found = false;
    cout << "Enter ID of the book to issue: ";
    cin >> issueId;
    for (int i = 0; i < numBooks; ++i) {
        if (library[i].id == issueId) {
            if (library[i].available) {
                library[i].available = false;
                cout << "Book '" << library[i].title << "' issued successfully.\n";
                cout << "Enter borrower's name: ";
                cin.ignore();
                getline(cin, library[i].borrower);
            } else {
                cout << "Book is already issued.\n";
            }
            found = true;
            break;
        }
    }
    if (!found) cout << "Book not found.\n";
}

void returnBook() {
    int returnId;
    bool found = false;
    cout << "Enter ID of the book to return: ";
    cin >> returnId;
    for (int i = 0; i < numBooks; ++i) {
        if (library[i].id == returnId) {
            if (!library[i].available) {
                library[i].available = true;
                library[i].borrower = "";
                cout << "Book '" << library[i].title << "' returned successfully.\n";
            } else {
                cout << "Book is already available.\n";
            }
            found = true;
            break;
        }
    }
    if (!found) cout << "Book not found.\n";
}

void listBooks() {
    if (numBooks == 0) {
        cout << "No books in the library.\n";
        return;
    }
    cout << "\nList of books in the library:\n";
    cout << "---------------------------------\n";
    cout << "ID\tTitle\t\tAuthor\tStatus\n";
    cout << "---------------------------------\n";
    for (int i = 0; i < numBooks; ++i) {
        cout << library[i].id << "\t" << library[i].title << "\t\t" << library[i].author << "\t";
        if (library[i].available)
            cout << "Available\n";
        else
            cout << "Issued to " << library[i].borrower << endl;
    }
    cout << "---------------------------------\n";
}

void deleteBook() {
    int deleteId;
    bool found = false;
    cout << "Enter ID of the book to delete: ";
    cin >> deleteId;
    for (int i = 0; i < numBooks; ++i) {
        if (library[i].id == deleteId) {
            for (int j = i; j < numBooks - 1; ++j) {
                library[j] = library[j + 1];
            }
            numBooks--;
            cout << "Book deleted successfully.\n";
            found = true;
            break;
        }
    }
    if (!found) cout << "Book not found.\n";
}