北京交通大学微机原理课程设计题目：画圆程序，其中要求圆可以变换颜色、进行运动。本代码可用作课堂教学与自学使用。-Course design for microcomputer principles, Beijing Jiaotong University topic: Circle program, which calls for round can change color, movement. This code can be used as classroom teaching and self-study use.