Java HiLow 百分比机会计算器 - 明显的逻辑问题

Question

我在使用基于 Java 的概率计算器进行 HiLow 游戏迭代时遇到了一些困难(特别是这个: http://bitino.com/hi-lo/ )。该程序的目标是在给定 CHANCE_THRESHOLD 值的情况下统计建议投注。该程序还跟踪所玩的牌。我遇到的问题与机会计算有关。到目前为止，我已经成功解决了“A”(Ace)的值，但在测试其他值时遇到了问题。显然，概率百分比估值背后的逻辑一定有问题。

import java.util.Scanner;

public class HiLow {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        String flip = "";
        double flipInt = 0.0;

        final double CHANCE_THRESHOLD = 0.75;
        double chanceLower = 0;
        double chanceHigher = 0;

        String cardArray[] = { "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K" };
        int cardValue[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };

        int cardCounter[] = { 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 };

        int remainingCards = 0;

        while (!(flip.equalsIgnoreCase("e"))) {

            for (int x = 0; x < cardCounter.length; x++) {
                cardCounter[x] = 4;
            }

            chanceLower = 0;
            chanceHigher = 0;

            System.out.print(" > ");
            flip = scan.next();

            while (!(flip.equalsIgnoreCase("r")) && !(flip.equalsIgnoreCase("e"))) {

                for (int x = 0; x < 13; x++) {
                    if (flip.equalsIgnoreCase(cardArray[x])) {
                        flipInt = cardValue[x];
                        cardCounter[x]--;
                    }
                }

                remainingCards = 0;
                for (int x = 0; x < cardCounter.length; x++) {
                        remainingCards = remainingCards + cardCounter[x];
                }

                chanceLower = (((flipInt) - 1) + cardCounter[(int) (flipInt - 1)]) / remainingCards;
                System.out.println((((flipInt) - 1) + cardCounter[(int) (flipInt - 1)]) + " / " + remainingCards + " = " + chanceLower);

                // This line should output 0.98039215686 given the input of 'a'
                //chanceHigher = ((13 - (flipInt)) + cardCounter[(int) (flipInt - 1)]) / remainingCards;
                //System.out.println(((13 - (flipInt)) + cardCounter[(int) (flipInt - 1)]) + " / " + remainingCards + " = " + chanceHigher);

                chanceHigher = Math.abs(1 - chanceLower);
                System.out.println(Math.abs((((flipInt) - 1) + cardCounter[(int) (flipInt - 1)]) - remainingCards) + " / " + remainingCards + " = " + chanceHigher);


                if (chanceLower > chanceHigher) {
                    if (chanceLower >= CHANCE_THRESHOLD) {
                        System.out.println("Bet Lower.");
                    } else if (chanceLower > (CHANCE_THRESHOLD - 0.10)){
                        System.out.println("Bet with Caution.");
                    } else {
                        System.out.println("Risk Outside Threshold.");
                    }

                } else {
                    if (chanceHigher >= CHANCE_THRESHOLD) {
                        System.out.println("Bet Higher.");
                    } else if (chanceHigher > (CHANCE_THRESHOLD - 0.10)){
                        System.out.println("Bet with Caution.");
                    } else {
                        System.out.println("Risk Outside Threshold.");
                    }
                }

                for (int x = 0; x < cardCounter.length; x++) {
                    System.out.print(cardCounter[x] + ":" + cardArray[x] + " ");
                }
                System.out.print("\n");

                System.out.print(" > ");
                flip = scan.next();

            }
        }
    }
}

一如既往，非常感谢您的帮助。提前谢谢您。

Answer 1

首先，您没有关闭扫描仪，但我猜它只是被忽略了。

其次剩余的卡牌还不够。这一次，您不应该计算相同值(value)的剩余牌 - 这些牌没有更高或更低，只是相同。

无需计算整个大/小牌数组，2个变量就足够了

remainingLowerCards = 0;
remainingHigherCards = 0;
for (int x = 0; x < cardCounter.length; x++) {
    remainingCards = remainingCards + cardCounter[x];
    if (x < flipInt - 1) {
        remainingLowerCards += cardCounter[x];
    } else if (x >= flipInt) {
        remainingHigherCards += cardCounter[x];
    }
}

chanceLower = ((double) remainingLowerCards) / remainingCards;
System.out.println("Lower: " + remainingLowerCards + " / " + remainingCards + " = " + chanceLower);

// This line should output 0.98039215686 given the input of 'a'
chanceHigher = ((double) remainingHigherCards) / remainingCards;
System.out.println("Higher: " + remainingHigherCards + " / " + remainingCards + " = "
        + chanceHigher);