设计一个21点的游戏，游戏规则如下：

两个玩家，一个是人，一个是电脑。首先由电脑随机派两张牌给人类玩家（牌不能重复，牌的表示方式为 花色牌号，如红桃8），然后玩家通过自己判断再选择是否继续要牌。如果要，则继续随机派给玩家一张牌，若此时所有牌的点数之和大于21，则判断玩家为输，如果不是，则玩家可以继续选择要牌与否。如果不要牌，则人类玩家阶段结束。轮到电脑。电脑阶段与玩家阶段基本相同。电脑首先自己要两张牌，然后由电脑自己判断是否继续要牌，判断的最重要依据是刚好赢人类玩家就收手。而输赢是按照两家的点数与牌数，赢的一方是点数较大的一方，若点数相同，则取牌数量更多的一方胜，若牌数也一样，则不分胜负。

点数的计算方式为：不论花色（红桃，黑桃，梅花，方块），数字牌（2到10）按照数字算，A按照1来算， J，Q，K均算成0.5点。

-Design of a 21-point game, rules of the game are as follows: two players, one person, one computer. First, the computer randomly send two cards to a human player (cards can not be repeated, in the form of a color card grades, such as hearts 8), then the players through their own judgment and then choose whether to continue to license. If so, then continue randomly send a card to the player, if this case all the points of the cards is greater than 21, it is determined that the player to lose, if not, then the player can continue to choose to license or not. If you do not license, the end stage of human players. Turn the computer. Computer stage and the stage is basically the same players. Computer first two cards they want, and then by the computer to determine whether to continue to license its own, is the most important basis for judging human players just won close hand. The winners and losers are in accordance with the number of points the two cards, the winning party is one of the