这是一段DOS下的五子棋实现，通过输入坐标值会在棋盘的相应位置放置一枚棋子，黑白双方交替输入，当一方获胜程序结束。-This is the period of the DOS backgammon achieve by entering coordinate values ​ ​ will place a pawn in the corresponding position of the chessboard, black and white sides alternatel