说明：C语言课程设计作品功能：仿Windows的自带计算器环境：DOS大小：800多行特色：图形界面，支持鼠标，算法稍有复杂 -Descr iption: C language curriculum design works features: imitation of its own Windows Calculator Environment: DOS Size: 800 multi-line features: a graphical interface to support the mo