此程序主要是让读者熟悉c语言图形模式下的编程，了解系统绘图及数据结构的知识，此重难点是 时 分 秒针坐标值的计算和时钟指针的运行控制，有兴趣的话，可让程序支持鼠标操作，-This program is designed to allow the reader familiar with the c language graphics mode programming, understanding of the system mapping and data structure knowledge, this important and difficult is the hours of second hand coordinate calculation and the clock hands of operational control, are interested, you can let the program to support the mouse operation,