要求学生在六个数码管滚动显示自己的学号（六位），每隔一定时间循环移位一次，学号为奇数则左移，学号为偶数则右移。间隔时间可由开关选择1秒，2秒，3秒和4秒。-Requires students in six digital scroll to show their student number (six), rotate once every certain period of time, the student number is odd, then left, then right stude