Introduction

The Library Management System (LMS) is a software application designed to manage library operations such as handling books, members, and issuing/returning books. This system helps to keep track of the inventory, provides an efficient way to maintain member details, and ensures smooth management of library resources.

Objective

The objective of this project is to develop a simple and efficient Library Management System using the C programming language. The system will allow the librarian to perform tasks like adding books, viewing book details, adding members, issuing books to members, and managing returns.

Code Implementation

#include 
#include 

#define MAX_BOOKS 100
#define MAX_MEMBERS 50

// Structure for Book Information
struct Book {
    int bookID;
    char title[100];
    char author[100];
    int quantity;
};

// Structure for Member Information
struct Member {
    int memberID;
    char name[100];
    int booksIssued;
};

// Function to Add a Book
void addBook(struct Book library[], int *bookCount) {
    printf("\nEnter Book ID: ");
    scanf("%d", &library[*bookCount].bookID);
    printf("Enter Book Title: ");
    getchar(); // To consume the newline character from previous input
    fgets(library[*bookCount].title, 100, stdin);
    library[*bookCount].title[strcspn(library[*bookCount].title, "\n")] = '\0'; // Remove newline
    printf("Enter Author Name: ");
    fgets(library[*bookCount].author, 100, stdin);
    library[*bookCount].author[strcspn(library[*bookCount].author, "\n")] = '\0'; // Remove newline
    printf("Enter Book Quantity: ");
    scanf("%d", &library[*bookCount].quantity);
    (*bookCount)++;
    printf("\nBook Added Successfully!\n");
}

// Function to Display All Books
void displayBooks(struct Book library[], int bookCount) {
    if (bookCount == 0) {
        printf("\nNo Books Available.\n");
        return;
    }
    printf("\nBooks Available in Library:\n");
    for (int i = 0; i < bookCount; i++) {
        printf("\nBook ID: %d\nTitle: %s\nAuthor: %s\nQuantity: %d\n", library[i].bookID, library[i].title, library[i].author, library[i].quantity);
    }
}

// Function to Add a Member
void addMember(struct Member members[], int *memberCount) {
    printf("\nEnter Member ID: ");
    scanf("%d", &members[*memberCount].memberID);
    printf("Enter Member Name: ");
    getchar(); // To consume the newline character from previous input
    fgets(members[*memberCount].name, 100, stdin);
    members[*memberCount].name[strcspn(members[*memberCount].name, "\n")] = '\0'; // Remove newline
    members[*memberCount].booksIssued = 0;
    (*memberCount)++;
    printf("\nMember Added Successfully!\n");
}

// Function to Issue Book to Member
void issueBook(struct Book library[], int bookCount, struct Member members[], int memberCount) {
    int bookID, memberID;
    printf("\nEnter Member ID: ");
    scanf("%d", &memberID);
    printf("Enter Book ID: ");
    scanf("%d", &bookID);

    int bookFound = -1, memberFound = -1;

    // Find the book and check availability
    for (int i = 0; i < bookCount; i++) { if (library[i].bookID == bookID && library[i].quantity > 0) {
            bookFound = i;
            break;
        }
    }

    // Find the member
    for (int i = 0; i < memberCount; i++) {
        if (members[i].memberID == memberID) {
            memberFound = i;
            break;
        }
    }

    if (bookFound != -1 && memberFound != -1) {
        library[bookFound].quantity--;
        members[memberFound].booksIssued++;
        printf("\nBook Issued Successfully!\n");
    } else {
        printf("\nBook or Member not found.\n");
    }
}

// Main Function
int main() {
    struct Book library[MAX_BOOKS];
    struct Member members[MAX_MEMBERS];
    int bookCount = 0, memberCount = 0;
    int choice;

    do {
        printf("\nLibrary Management System Menu:\n");
        printf("1. Add Book\n");
        printf("2. Display Books\n");
        printf("3. Add Member\n");
        printf("4. Issue Book\n");
        printf("5. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addBook(library, &bookCount);
                break;
            case 2:
                displayBooks(library, bookCount);
                break;
            case 3:
                addMember(members, &memberCount);
                break;
            case 4:
                issueBook(library, bookCount, members, memberCount);
                break;
            case 5:
                printf("\nExiting Program...\n");
                break;
            default:
                printf("\nInvalid Choice, Please try again.\n");
        }
    } while (choice != 5);

    return 0;
}

Explanation of Program Structure

This program is divided into different sections for handling various functionalities of the library. It includes the following:

• Structures: We use two structures: one for storing book details (ID, title, author, quantity) and one for storing member details (ID, name, books issued).
• Functions:
  • addBook() allows the addition of new books to the library.
  • displayBooks() displays all available books in the library.
  • addMember() allows the addition of new members.
  • issueBook() issues a book to a member if available.
• Main Program: The program offers a menu-driven interface for the librarian to perform actions. The main loop runs until the user chooses to exit the program.

How to Run the Program

To run this program, follow the steps below:

• Ensure you have a C compiler installed (e.g., GCC).
• Save the code in a file with a .c extension, such as library_management.c.
• Open a terminal or command prompt and navigate to the folder containing the program.
• Compile the program using the command: gcc library_management.c -o library_management.
• Run the program using the command: ./library_management.
• Follow the on-screen menu to interact with the Library Management System.