DSA-Ideathon

This is a library management using hash tables,linked lists and functions with adding different templates .

#include <stdio.h> #include <stdlib.h> #include <string.h>

typedef struct Book { int id; char name[100]; char author[100]; int quantity; char date_added[11]; struct Book *next; } Book;

typedef struct IssuedBook { char name[100]; int roll_number; int year; char branch[50]; int book_id; char book_name[100]; char book_author[100]; int book_quantity; char issue_date[11]; struct IssuedBook *next; } IssuedBook;

typedef struct Student { char name[100]; int roll_number; char password[20]; struct Student *next; } Student;

Book *library = NULL; IssuedBook *issued_books = NULL; Student *students = NULL;

// Librarian credentials char librarian_id[20] = "admin"; char librarian_password[20] = "admin123";

// Function prototypes void addBook(); void removeBook(); void displayBooks(); void searchBook(); void updateBookDetails(); void issueBook(); void returnBook(); void historyOfIssuedBooks(); void librarianLogin(); void changeLibrarianCredentials(); void studentLogin(); void studentSignUp(); void mainMenu();

Book *createBook(int id, char *name, char *author, int quantity, char *date_added) { Book *newBook = (Book *)malloc(sizeof(Book)); if (!newBook) return NULL; newBook->id = id; strcpy(newBook->name, name); strcpy(newBook->author, author); newBook->quantity = quantity; strcpy(newBook->date_added, date_added); newBook->next = NULL; return newBook; }

void addBook() { printf("\n** Adding a new book **\n"); Book *b = (Book *)malloc(sizeof(Book)); if (!b) { printf("Failed to allocate memory.\n"); return; } printf("\n"); printf("Enter Book ID: "); scanf("%d", &b->id); printf("Enter Book Name: "); scanf(" %[^\n]s", b->name); printf("Enter Author Name: "); scanf(" %[^\n]s", b->author); printf("Enter Quantity: "); scanf("%d", &b->quantity); printf("Enter Adding Date (YYYY-MM-DD): "); scanf("%s", b->date_added); b->next = library; library = b; printf("\n"); printf("Book added successfully!\n"); }

void removeBook() { int id; printf("\n** Remove a Book **\n"); printf("\n"); printf("Enter Book ID to remove: "); scanf("%d", &id); Book **ptr = &library, *temp = NULL; while (*ptr) { Book *current = *ptr; if (current->id == id) { *ptr = current->next; free(current); printf("\n"); printf("Book removed successfully!\n"); return; } ptr = &current->next; } printf("\n"); printf("Book not found!\n"); }

void displayBooks() { printf("\n** Displaying all books **\n"); Book *ptr = library; printf("\n"); if (!ptr) printf("No books in the library.\n"); while (ptr) { printf("ID: %d, Name: %s, Author: %s, Quantity: %d, Added: %s\n", ptr->id, ptr->name, ptr->author, ptr->quantity, ptr->date_added); ptr = ptr->next; } }

void searchBook() { char name[100]; printf("\n** Search for a Book **\n"); printf("\n"); printf("Enter book name to search: "); scanf(" %[^\n]s", name); Book *ptr = library; int found = 0; while (ptr) { if (strcmp(ptr->name, name) == 0) { printf("Found Book - ID: %d, Name: %s, Author: %s, Quantity: %d, Added: %s\n", ptr->id, ptr->name, ptr->author, ptr->quantity, ptr->date_added); found = 1; break; } ptr = ptr->next; } if (!found) { printf("\n"); printf("Book not found!\n"); } }

void updateBookDetails() { int id; printf("\n** Update Book Details **\n"); printf("\n"); printf("Enter Book ID to update: "); scanf("%d", &id); Book *ptr = library; while (ptr) { if (ptr->id == id) { printf("Current Name: %s, Enter new Name: ", ptr->name); scanf(" %[^\n]s", ptr->name); printf("Current Author: %s, Enter new Author: ", ptr->author); scanf(" %[^\n]s", ptr->author); printf("Current Quantity: %d, Enter new Quantity: ", ptr->quantity); scanf("%d", &ptr->quantity); printf("\n"); printf("Book details updated successfully!\n"); return; } ptr = ptr->next; } printf("\n"); printf("Book not found!\n"); }

IssuedBook *createIssuedBook(char *name, int roll_number, int year, char *branch, int book_id, char *book_name, char *book_author, int book_quantity, char *issue_date) { IssuedBook *newIssuedBook = (IssuedBook *)malloc(sizeof(IssuedBook)); if (!newIssuedBook) return NULL; strcpy(newIssuedBook->name, name); newIssuedBook->roll_number = roll_number; newIssuedBook->year = year; strcpy(newIssuedBook->branch, branch); newIssuedBook->book_id = book_id; strcpy(newIssuedBook->book_name, book_name); strcpy(newIssuedBook->book_author, book_author); newIssuedBook->book_quantity = book_quantity; strcpy(newIssuedBook->issue_date, issue_date); newIssuedBook->next = NULL; return newIssuedBook; }

void issueBook() { int book_id; printf("\n** Issue a Book **\n"); printf("\n"); printf("Enter Book ID to issue: "); scanf("%d", &book_id); Book *book = library; while (book) { if (book->id == book_id && book->quantity > 0) { book->quantity--; IssuedBook *newIssued = (IssuedBook *)malloc(sizeof(IssuedBook)); if (!newIssued) { printf("Memory allocation failed.\n"); return; } printf("Enter your name: "); scanf(" %[^\n]s", newIssued->name); printf("Enter your roll number: "); scanf("%d", &newIssued->roll_number); printf("Enter your year of studying: "); scanf("%d", &newIssued->year); printf("Enter your branch: "); scanf(" %[^\n]s", newIssued->branch); strcpy(newIssued->book_name, book->name); strcpy(newIssued->book_author, book->author); newIssued->book_id = book->id; newIssued->book_quantity = 1; printf("Enter issue date (YYYY-MM-DD): "); scanf("%s", newIssued->issue_date); newIssued->next = issued_books; issued_books = newIssued; printf("\n"); printf("Book issued successfully!\n"); return; } book = book->next; } printf("\n"); printf("Book not available for issue or does not exist!\n"); }

void returnBook() { int roll_number, book_id; printf("\n** Return a Book **\n"); printf("\n"); printf("Enter your roll number: "); scanf("%d", &roll_number); printf("Enter Book ID to return: "); scanf("%d", &book_id); IssuedBook **ptr = &issued_books; while (*ptr) { IssuedBook *current = *ptr; if (current->roll_number == roll_number && current->book_id == book_id) { // Increment book quantity back in library Book *book = library; while (book) { if (book->id == book_id) { book->quantity++; break; } book = book->next; } *ptr = current->next; free(current); printf("\n"); printf("Book returned successfully!\n"); return; } ptr = &current->next; } printf("\n"); printf("No record found for your issued book!\n"); }

void historyOfIssuedBooks() { int roll_number; printf("\n** History of Issued Books **\n"); printf("\n"); printf("Enter your roll number to see history of issued books: "); scanf("%d", &roll_number); IssuedBook *ptr = issued_books; int found = 0; while (ptr) { if (ptr->roll_number == roll_number) { printf("Book ID: %d, Book Name: %s, Author: %s, Issue Date: %s\n", ptr->book_id, ptr->book_name, ptr->book_author, ptr->issue_date); found = 1; } ptr = ptr->next; } if (!found) { printf("\n"); printf("No issued books found for this roll number!\n"); } }

void librarianLogin() { char id[20], password[20]; printf("\n** Librarian Login **\n"); printf("\n"); printf("Enter librarian ID: "); scanf("%s", id); printf("Enter password: "); scanf("%s", password);

if (strcmp(id, librarian_id) == 0 && strcmp(password, librarian_password) == 0) {
    int choice;
    do {
        printf("\n** Librarian Menu **\n");
        printf("\n");
        printf("1. Add Book\n");
        printf("2. Remove Book\n");
        printf("3. Display Books\n");
        printf("4. Search for a Book\n");
        printf("5. Update Book Details\n");
        printf("6. Change Login Details\n");
        printf("7. Return to Main Menu\n");
        printf("\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1: addBook(); break;
            case 2: removeBook(); break;
            case 3: displayBooks(); break;
            case 4: searchBook(); break;
            case 5: updateBookDetails(); break;
            case 6: changeLibrarianCredentials(); break;
            case 7: return;  // Return to main menu
            default: printf("Invalid choice. Please enter a valid option.\n");
        }
    } while (choice != 7);
} else {
    printf("\n");
    printf("Invalid ID or Password!\n");
}

}

void changeLibrarianCredentials() { char currentPassword[20], newPassword[20]; printf("\n** Change Librarian Credentials **\n"); printf("\n"); printf("Enter current password: "); scanf("%s", currentPassword); if (strcmp(currentPassword, librarian_password) == 0) { printf("Enter new password: "); scanf("%s", newPassword); strcpy(librarian_password, newPassword); printf("\n"); printf("Password changed successfully!\n"); } else { printf("\n"); printf("Incorrect password!\n"); } }

void studentLogin() { int roll_number; char password[20]; printf("\n** Student Login **\n"); printf("\n"); printf("Enter your roll number: "); scanf("%d", &roll_number); printf("Enter your password: "); scanf("%s", password);

Student *ptr = students;
while (ptr) {
    if (ptr->roll_number == roll_number && strcmp(ptr->password, password) == 0) {
        int choice;
        do {
            printf("\n** Student Menu **\n");
            printf("\n");
            printf("1. Issue Book\n");
            printf("2. Return Book\n");
            printf("3. Display Books\n");
            printf("4. History of Issued Books\n");
            printf("5. Return to Main Menu\n");
            printf("\n");
            printf("Enter your choice: ");
            scanf("%d", &choice);
            switch (choice) {
                case 1: issueBook(); break;
                case 2: returnBook(); break;
                case 3: displayBooks(); break;
                case 4: historyOfIssuedBooks(); break;
                case 5: return;  // Return to main menu
                default: printf("Invalid choice. Please enter a valid option.\n");
            }
        } while (choice != 5);
        return;
    }
    ptr = ptr->next;
}
printf("\n");
printf("Invalid roll number or password!\n");

}

void studentSignUp() { printf("\n** Student Sign Up **\n"); Student *newStudent = (Student *)malloc(sizeof(Student)); if (!newStudent) { printf("Failed to allocate memory.\n"); return; } printf("\n"); printf("Enter your name: "); scanf(" %[^\n]s", newStudent->name); printf("Enter your roll number: "); scanf("%d", &newStudent->roll_number); printf("Create a password: "); scanf("%s", newStudent->password); newStudent->next = students; students = newStudent; printf("\n"); printf("Registration successful! You can now log in using your roll number and password.\n"); }

void mainMenu() { int choice; do { printf("\n\n"); printf("\t\t\t \n"); printf("\t\t\t * \n"); printf("\t\t\t * \n"); printf("\t\t\t * ---------------------------- \n"); printf("\t\t\t * WELCOME TO e-LIBRARY \n"); printf("\t\t\t * ---------------------------- \n"); printf("\t\t\t * IIT JODHPUR \n"); printf("\t\t\t * \n"); printf("\t\t\t * \n"); printf("\t\t\t \n"); printf("\n\n"); printf("\n\t\t\t\n"); printf("\n\t\t\t\t MAIN MENU: \n"); printf("\n\t\t\t\t 1.LIBRARIAN LOGIN "); printf("\n\t\t\t\t 2.STUDENT LOGIN "); printf("\n\t\t\t\t 3.STUDENT SIGN UP "); printf("\n\t\t\t\t 4.EXIT\n "); printf("\n\t\t\t**********\n"); printf("\n\t\t\t\t Enter your choice: "); scanf("%d", &choice); switch (choice) { case 1: librarianLogin(); break; case 2: studentLogin(); break; case 3: studentSignUp(); break; case 4: printf("Exiting the system.\n"); return; default: printf("Invalid choice. Please enter a valid option.\n"); } } while (choice != 4); }

int main() { mainMenu(); return 0; }