游戏的程序共三个界面，包含的功能有：背景音乐的播放，按钮的点击，弹弓的移动，小鸟的发射，小鸟最终的飞行轨迹，小鸟飞行方向和范围的判断。-A total of three games program interface includes features include: background music, click on the button, slingshot move, launching birds, birds final flight path, bird flight direc