说明：  本书是“ 清华大学计算机基础教育课程系列教材” 中的 《Vi s u a l C+ + 面向对象与可视化程序设计》一书的配套教 材
(The book is" Tsinghua University Computer Basic Education Curriculum Textbook Series". " Vi S U a l C++ object oriented programming with visual design," a book supporting teaching Material)