Untitled

Project library management system : 

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

#define MAX_BOOKS 100
#define MAX_TITLE_LENGTH 50

typedef struct {
    int id;
    char title[MAX_TITLE_LENGTH];
    char author[MAX_TITLE_LENGTH];
    int isIssued;
    char dueDate[11]; // Format: YYYY-MM-DD
} Book;

Book library[MAX_BOOKS];
int bookCount = 0;

void addBook() {
    if (bookCount >= MAX_BOOKS) {
        printf("Library is full! Cannot add more books.\n");
        return;
    }

    printf("Enter Book ID: ");
    scanf("%d", &library[bookCount].id);
    getchar(); // Consume the newline character

    printf("Enter Book Title: ");
    fgets(library[bookCount].title, MAX_TITLE_LENGTH, stdin);
    library[bookCount].title[strcspn(library[bookCount].title, "\n")] = 0; // Remove newline

    printf("Enter Author Name: ");
    fgets(library[bookCount].author, MAX_TITLE_LENGTH, stdin);
    library[bookCount].author[strcspn(library[bookCount].author, "\n")] = 0; // Remove newline

    library[bookCount].isIssued = 0; // Book is not issued initially
    strcpy(library[bookCount].dueDate, ""); // No due date

    bookCount++;
    printf("Book added successfully!\n");
}




void issueBook() {
    int id, found = 0;

    printf("Enter Book ID to Issue: ");
    scanf("%d", &id);

    for (int i = 0; i < bookCount; i++) {
        if (library[i].id == id) {
            found = 1;
            if (library[i].isIssued) {
                printf("Book is already issued.\n");
            } else {
                library[i].isIssued = 1;
                printf("Enter Due Date (YYYY-MM-DD): ");
                scanf("%s", library[i].dueDate);
                printf("Book issued successfully!\n");
            }
            break;
        }
    }

    if (!found) {
        printf("Book with ID %d not found.\n", id);
    }
}

void viewBooks() {
    if (bookCount == 0) {
        printf("No books in the library.\n");
        return;
    }

    printf("\nLibrary Books:\n");
    printf("ID\tTitle\t\tAuthor\t\tStatus\n");
    printf("---------------------------------------------\n");

    for (int i = 0; i < bookCount; i++) {
        printf("%d\t%s\t\t%s\t\t%s\n", library[i].id, library[i].title, library[i].author,
               library[i].isIssued ? "Issued" : "Available");
    }
}

void saveToFile() {
    FILE *file = fopen("library.txt", "w");
    if (!file) {
        printf("Error saving library to file.\n");
        return;
    }

    for (int i = 0; i < bookCount; i++) {
        fprintf(file, "%d,%s,%s,%d,%s\n", library[i].id, library[i].title, library[i].author,
                library[i].isIssued, library[i].dueDate);
    }

    fclose(file);
    printf("Library saved to file successfully.\n");
}

void loadFromFile() {
    FILE *file = fopen("library.txt", "r");
    if (!file) {
        printf("No saved library file found.\n");
        return;
    }

    bookCount = 0;
    while (fscanf(file, "%d,%49[^,],%49[^,],%d,%10s\n", &library[bookCount].id,
                  library[bookCount].title, library[bookCount].author,
                  &library[bookCount].isIssued, library[bookCount].dueDate) != EOF) {
        bookCount++;
    }

    fclose(file);
    printf("Library loaded from file successfully.\n");
}

int main() {
    int choice;

    loadFromFile();

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

        switch (choice) {
            case 1:
                addBook();
                break;
            case 2:
                issueBook();
                break;
            case 3:
                viewBooks();
                break;
            case 4:
                saveToFile();
                printf("Exiting the program.\n");
                break;
            default:
                printf("Invalid choice. Please try again.\n");
        }
    } while (choice != 4);

    return 0;
}