#include stdioh#include stdlibh#include stringhtypedef struct Node char bookCode20; char bookName50; char author50; char publisher50; char bookkind50; char bookkinds50; float pri

return; }

BookNode *current = head;
while (current != NULL) {
    if (strcmp(current->bookCode, bookCode) == 0) {
        if (current->borrowed) {
            current->borrowed = 0;
            printf("归还成功！\n");
        } else {
            printf("该图书未借出！\n");
        }
        return;
    }
    current = current->next;
}

printf("没有找到相关图书！\n");

}

void displayMenu() { printf("欢迎使用图书管理系统！\n"); printf("1. 添加图书\n"); printf("2. 删除图书\n"); printf("3. 修改图书信息\n"); printf("4. 查找图书\n"); printf("5. 借阅图书\n"); printf("6. 归还图书\n"); printf("7. 退出系统\n"); printf("请输入选项："); }

int main() { loadBookData();

int choice;
do {
    displayMenu();
    scanf("%d", &choice);

    switch (choice) {
        case 1:
            addBook();
            break;
        case 2:
            deleteBook();
            break;
        case 3:
            modifyBook();
            break;
        case 4:
            searchBook();
            break;
        case 5:
            borrowBook();
            break;
        case 6:
            returnBook();
            break;
        case 7:
            saveBookData();
            break;
        default:
            printf("无效选项！\n");
            break;
    }
} while (choice != 7);

return 0;

}