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。-A 21- point games, rules of the game are as follows :

Two players , one person , one computer . First two cards sent randomly by the computer to human players ( cards can not be repeated , brand representation for color grades, such as hearts 8 ) , then the players through their own judgment and then choose whether to continue to be licensed . If you want , then randomly assigned to continue the player a card, if all the cards at this point is greater than 21 , it is determined to lose players , 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. PC gamers stage with the same phase . Computer first two cards they want , and then by the computer to determine whether to continue their own brand , the most important basis of human judgment is just to win the player to stop. And win or lose and the number of licenses is based on two points , the winning party is one of the larger points , more point