设计与实现：图书借阅管理系统功能概述、开发环境与工具使用、自定义类设计说明。

The course design report for the Library Borrowing Management System outlines the functionality and development environment of the system. The system is designed based on Object Oriented Programming principles and implemented using C language, with a user-friendly interface created using the QT GUI framework. The system supports multiple user roles, such as Readers and Administrators, each with different permissions and functionalities. Readers can log in, view book information, borrow and return books, and update their personal information. Administrators, on the other hand, have additional capabilities such as managing book information, reader information, administrator information, and approving borrowing and returning requests. The custom class structure of the system includes classes for Book, Reader, Administrator, BorrowList, and ReturnList, each defining the properties and methods related to their respective entities. Data persistence is achieved through text files to store the information permanently. The development environment and tools used for the project include C language for programming, QT GUI framework for creating the visual interface, and text files for data storage. The system design ensures efficient data transmission between windows using QT signals and slots. In conclusion, the Library Borrowing Management System offers a user-friendly and efficient platform for managing book borrowing activities for both readers and administrators. The implementation of Object Oriented Programming principles and the use of C language and QT GUI framework ensure a robust and scalable solution for library management.