图书管理系统借阅管理c语言

根据提供的引用内容，以下是一个简单的C语言图书管理系统的借阅管理功能的示例：

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

#define MAX_BOOKS 100
#define MAX_BORROWERS 100

typedef struct {
    int bookId;
    char title[100];
    char author[100];
    int isBorrowed;
} Book;

typedef struct {
    int borrowerId;
    char name[100];
    int borrowedBooks[MAX_BOOKS];
    int numBorrowedBooks;
} Borrower;

Book books[MAX_BOOKS];
Borrower borrowers[MAX_BORROWERS];
int numBooks = 0;
int numBorrowers = 0;

void addBook() {
    if (numBooks >= MAX_BOOKS) {
        printf("The library is full.\n");
        return;
    }

    Book newBook;
    printf("Enter book ID: ");
    scanf("%d", &newBook.bookId);
    printf("Enter book title: ");
    scanf("%s", newBook.title);
    printf("Enter book author: ");
    scanf("%s", newBook.author);
    newBook.isBorrowed = 0;

    books[numBooks] = newBook;
    numBooks++;

    printf("Book added successfully.\n");
}

void borrowBook() {
    int bookId, borrowerId;
    printf("Enter book ID: ");
    scanf("%d", &bookId);
    printf("Enter borrower ID: ");
    scanf("%d", &borrowerId);

    Book *book = NULL;
    for (int i = 0; i < numBooks; i++) {
        if (books[i].bookId == bookId) {
            book = &books[i];
            break;
        }
    }

    Borrower *borrower = NULL;
    for (int i = 0; i < numBorrowers; i++) {
        if (borrowers[i].borrowerId == borrowerId) {
            borrower = &borrowers[i];
            break;
        }
    }

    if (book == NULL || borrower == NULL) {
        printf("Invalid book ID or borrower ID.\n");
        return;
    }

    if (book->isBorrowed) {
        printf("The book is already borrowed.\n");
        return;
    }

    if (borrower->numBorrowedBooks >= MAX_BOOKS) {
        printf("The borrower has reached the maximum number of borrowed books.\n");
        return;
    }

    book->isBorrowed = 1;
    borrower->borrowedBooks[borrower->numBorrowedBooks] = bookId;
    borrower->numBorrowedBooks++;

    printf("Book borrowed successfully.\n");
}

void returnBook() {
    int bookId, borrowerId;
    printf("Enter book ID: ");
    scanf("%d", &bookId);
    printf("Enter borrower ID: ");
    scanf("%d", &borrowerId);

    Book *book = NULL;
    for (int i = 0; i < numBooks; i++) {
        if (books[i].bookId == bookId) {
            book = &books[i];
            break;
        }
    }

    Borrower *borrower = NULL;
    for (int i = 0; i < numBorrowers; i++) {
        if (borrowers[i].borrowerId == borrowerId) {
            borrower = &borrowers[i];
            break;
        }
    }

    if (book == NULL || borrower == NULL) {
        printf("Invalid book ID or borrower ID.\n");
        return;
    }

    if (!book->isBorrowed) {
        printf("The book is not borrowed.\n");
        return;
    }

    int found = 0;
    for (int i = 0; i < borrower->numBorrowedBooks; i++) {
        if (borrower->borrowedBooks[i] == bookId) {
            borrower->borrowedBooks[i] = borrower->borrowedBooks[borrower->numBorrowedBooks - 1];
            borrower->numBorrowedBooks--;
            found = 1;
            break;
        }
    }

    if (!found) {
        printf("The borrower did not borrow this book.\n");
        return;
    }

    book->isBorrowed = 0;

    printf("Book returned successfully.\n");
}

void displayBooks() {
    printf("Books in the library:\n");
    for (int i = 0; i < numBooks; i++) {
        printf("Book ID: %d\n", books[i].bookId);
        printf("Title: %s\n", books[i].title);
        printf("Author: %s\n", books[i].author);
        printf("Status: %s\n", books[i].isBorrowed ? "Borrowed" : "Available");
        printf("\n");
    }
}

void displayBorrowers() {
    printf("Borrowers:\n");
    for (int i = 0; i < numBorrowers; i++) {
        printf("Borrower ID: %d\n", borrowers[i].borrowerId);
        printf("Name: %s\n", borrowers[i].name);
        printf("Borrowed books:\n");
        for (int j = 0; j < borrowers[i].numBorrowedBooks; j++) {
            printf("- Book ID: %d\n", borrowers[i].borrowedBooks[j]);
        }
        printf("\n");
    }
}

int main() {
    int choice;

    do {
        printf("1. Add book\n");
        printf("2. Borrow book\n");
        printf("3. Return book\n");
        printf("4. Display books\n");
        printf("5. Display borrowers\n");
        printf("0. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addBook();
                break;
            case 2:
                borrowBook();
                break;
            case 3:
                returnBook();
                break;
            case 4:
                displayBooks();
                break;
            case 5:
                displayBorrowers();
                break;
            case 0:
                printf("Exiting...\n");
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }

        printf("\n");
    } while (choice != 0);

    return 0;
}