这个程序的关键是表示蛇的图形以及蛇的移动。用一个小星形表示蛇的一节身体，身体每长一节，增加一个星形块，蛇头用两节表示。移动时必须从蛇头开始，所以蛇不能向相反方向移动，也就是蛇尾不能改作蛇头。如果不按任何键，蛇自行在当前方向上前移，当游戏者按了有效的方向键后，蛇头朝着指定的方向移动，一步移动一节身体，所以当按了有效的方向键后，先确定蛇头的位置，然后蛇身体随着蛇头移动，图形的实现是从蛇头的新位置开始画出蛇，这时由于没有清屏的原因，原来蛇的位置和新蛇的位置差一个单位，所以看起来蛇会多一节身体，所以将蛇的最后一节用背景色覆盖。食物的出现和消失也是画矩形块和覆盖星形块-The key to this procedure is represented snake graphics and the moving of the snake. Said a snake with a small star-shaped body, the body per an increase of a star-shaped block, snakeheads two. Must move from the snakeheads started so the snake can not move in the opposite direction, that is, Brittlestar not converted snakeheads. If you do not press any key, the snake itself in the current direction forward, when the game press the arrow keys, smugglers move toward the specified direction, moving one step body, so when you press the arrow keys first determine the location of the snakeheads snake body then With smugglers mobile, the realization of graphics is the new location from the snakeheads draw snake, this time because there is no reason of the screen is cleared, the original snake position and a new snake positional difference a unit, so it looks like a snake would be more than a body, so the last one of the snake with the background color coverage. The appearance and disappearan