修改的别人的源码，不过这是一个模拟程序，不是游戏，军舰的炮弹是自动跟踪潜艇的，潜艇有两种速度，炮弹以打到为终。开始时先设置参数-modified the source of others, but this is a simulation, not games, Warships from the shells of automatic tracking submarines, submarines have two speeds, s