设计并实现海龟抽象数据类型Turtle，并以此为基础设计一个演示海龟作图的程序。

〔基本要求〕

（1）设置海龟类型的基本操作为：

procedure StartTurtleGraphlcs ；

｛显示作图窗口，并在窗口内写出本人的姓名、上机号和实验题号。｝

procedure StartTurtle；

｛令海龟处于作图的初始状态。即显示作图窗口，并将海龟定位在窗口正中；}

｛置画笔状态为落笔、龟头朝向为0度（正东方向）。｝

-Design and implementation of abstract data types of sea turtles Turtle, and as a basis for designing a presentation turtle drawing program. Basic requirements 〔〕 (1) set the basic operation of the type of sea turtles as: procedure StartTurtleGraphlcs　(display mapping window, and the window to write my name on the machine number and the experiment Question. ) Procedure StartTurtle　(enable mapping of sea turtles in the initial state. Drawing window is displayed, and sea turtles located in the window center ) (set state brush strokes, the glans toward 0 degrees (due east). )