在这个项目中，我们将实现一个简化版本的纸牌游戏叫黑捷克，也有时也被称为21。程序实现了黑捷克的基本规则。

为了让你实现抽象数据类型（ADT），使用接口（抽象的经验

），并使用接口/实现继承。-In this project, we will implement a simplified version of the card game called Blackjack, also

sometimes called 21. It is a relatively simple game played with a standard deck of 52 playing

cards. There are two principals, a dealer and a player. The player starts with a bankroll, and the

game progresses in rounds called hands.

At the start of each hand, the player decides how much to wager on this hand. It can be any

amount between some minimum allowable wager and the player’s total bankroll, inclusive.

After the wager, the dealer deals a total of four cards: the first face-up to the player, the second

face-up to himself, the third face-up to the player, and the fourth face-down to himself. The

second card of the dealer which is face-down is called the hole card.