在屏幕上绘制一个五角星，每按一次键盘转九十度。用循环程序计算五角星的顶点，画直线完成。五角星显示的位置、大小和转动的方向由键盘输入，并将输入的数据送文件保存。按回车键程序结束-Drawing on the screen of a five-pointed star, every time the keyboard to ninety. Procedures for calculating the cycle of five-pointed star with the vertex, draw a