基于C语言的图书管理系统设计的代码

好的，以下是一个简单的基于C语言的图书管理系统设计的代码示例：

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

// 定义图书结构体
struct book {
    char title[100];
    char author[50];
    char ISBN[20];
    int year;
    int quantity;
};

// 定义全局变量
struct book *books;
int num_books = 0;

// 函数声明
void add_book();
void remove_book();
void search_book();
void borrow_book();
void return_book();

int main() {
    int choice;
    printf("Welcome to the library management system!\n");

    while(1) {
        printf("\nEnter your choice:\n");
        printf("1. Add book\n");
        printf("2. Remove book\n");
        printf("3. Search book\n");
        printf("4. Borrow book\n");
        printf("5. Return book\n");
        printf("6. Quit\n");
        scanf("%d", &choice);

        switch(choice) {
            case 1:
                add_book();
                break;
            case 2:
                remove_book();
                break;
            case 3:
                search_book();
                break;
            case 4:
                borrow_book();
                break;
            case 5:
                return_book();
                break;
            case 6:
                printf("Goodbye!\n");
                exit(0);
            default:
                printf("Invalid choice!\n");
                break;
        }
    }

    return 0;
}

void add_book() {
    struct book new_book;
    printf("Enter the book title: ");
    scanf("%s", new_book.title);
    printf("Enter the author name: ");
    scanf("%s", new_book.author);
    printf("Enter the ISBN: ");
    scanf("%s", new_book.ISBN);
    printf("Enter the publication year: ");
    scanf("%d", &new_book.year);
    printf("Enter the quantity: ");
    scanf("%d", &new_book.quantity);

    num_books++;
    books = (struct book*)realloc(books, num_books * sizeof(struct book));
    books[num_books-1] = new_book;

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

void remove_book() {
    char ISBN[20];
    printf("Enter the ISBN of the book you want to remove: ");
    scanf("%s", ISBN);

    int found = 0;
    for(int i=0; i<num_books; i++) {
        if(strcmp(books[i].ISBN, ISBN) == 0) {
            found = 1;
            for(int j=i; j<num_books-1; j++) {
                books[j] = books[j+1];
            }
            num_books--;
            books = (struct book*)realloc(books, num_books * sizeof(struct book));
            printf("Book removed successfully!\n");
            break;
        }
    }

    if(!found) {
        printf("Book not found!\n");
    }
}

void search_book() {
    char ISBN[20];
    printf("Enter the ISBN of the book you want to search: ");
    scanf("%s", ISBN);

    int found = 0;
    for(int i=0; i<num_books; i++) {
        if(strcmp(books[i].ISBN, ISBN) == 0) {
            found = 1;
            printf("Book title: %s\n", books[i].title);
            printf("Author name: %s\n", books[i].author);
            printf("Publication year: %d\n", books[i].year);
            printf("Quantity: %d\n", books[i].quantity);
            break;
        }
    }

    if(!found) {
        printf("Book not found!\n");
    }
}

void borrow_book() {
    char ISBN[20];
    printf("Enter the ISBN of the book you want to borrow: ");
    scanf("%s", ISBN);

    int found = 0;
    for(int i=0; i<num_books; i++) {
        if(strcmp(books[i].ISBN, ISBN) == 0) {
            found = 1;
            if(books[i].quantity > 0) {
                books[i].quantity--;
                printf("Book borrowed successfully!\n");
            } else {
                printf("Book not available!\n");
            }
            break;
        }
    }

    if(!found) {
        printf("Book not found!\n");
    }
}

void return_book() {
    char ISBN[20];
    printf("Enter the ISBN of the book you want to return: ");
    scanf("%s", ISBN);

    int found = 0;
    for(int i=0; i<num_books; i++) {
        if(strcmp(books[i].ISBN, ISBN) == 0) {
            found = 1;
            books[i].quantity++;
            printf("Book returned successfully!\n");
            break;
        }
    }

    if(!found) {
        printf("Book not found!\n");
    }
}

这只是一个简单的示例，您可以根据实际需求进行修改和优化。希望对您有所帮助！