c语言中图形界面的编写：包括（1）窗口函数（2）窗口图形（3）光标函数（4）屏幕文本函数(5)状态查询（6）弹出菜单（7）下拉菜单（8）左右窗口-c language in the preparation of a graphical interface include: (1) window function (2) window graphics (3) the cursor function (4) screen copy function (5) status query (6) pop