使用双打来投注/投注（HiLo Dice-roll Game）

时间：2017-12-15 15:27:08

标签： java validation while-loop double

我有一个工作的10面骰子掷骰子HiLo猜谜游戏，正确为：

public static void main(String args[]) {
Scanner input = new Scanner (System.in);
        //roll one
        int rNum1 = (int)(10*Math.random()+1); //declare random roll one,  gives result between 1 and 10

        //print roll one
        System.out.println("You roll the 10-sided die."); 
        System.out.println("It lands on " + rNum1 + "."); //result between 1 and 10
        System.out.println(); //space

        //User guess
        System.out.println("Will a second die roll higher or lower?");
        System.out.println("To guess higher enter [1], or to guess lower, enter [2].");

        //roll two
        int rNum2 = (int)(10*Math.random()+1); //declare random roll two, gives result between 1 and 10
        int guess = input.nextInt(); //user's guess / HiLo

        //invalid user entry
        while(guess != 1 && guess != 2) 
        {
            System.out.println("Invalid entry"); // print incorrect guess entry input
            System.out.println("To guess higher enter [1], or to guess lower, enter [2].");
            guess = input.nextInt(); //reset scanner "input"
        }

        //print roll two
        System.out.println(); //space
        System.out.println("You roll the die again."); 
        System.out.println("It lands on " + rNum2 + "."); //result between 1 and 10
        System.out.println(); //space

        if (guess == 1) //guessed higher
        {
            if (rNum1 == rNum2)
            {
                System.out.println("Draw!");
            }
            else if (rNum1 > rNum2)
            {
                System.out.println("You guessed incorrectly.");
            }
            else
            {
                System.out.println("You guessed correctly!");
            }
        }

        if (guess == 2) //guessed lower
        {
            if (rNum1 == rNum2)
            {
                System.out.println("Draw!");
            }
            else if (rNum1 > rNum2)
            {
                System.out.println("You guessed correctly!");
            }
            else
            {
                System.out.println("You guessed incorrectly.");
            }
        }

现在我试图允许用户下注。允许用户根据正确的HiLo猜测从他们的底池（双钱）设置初始值（双初始）和工资（双赌注）。如果他们输了，他们就会失去赌注，如果他们赢了，他们就会获得150％的赌注：

if (guess == 2) //guessed lower
        {
            if (rNum1 == rNum2) //draw
            {
                System.out.println("Draw! Nothing lost, nothing gained!");
            }
            else if (rNum1 > rNum2) //correct guess
            {
                System.out.println("You guessed correctly!");
                money = money*1.5; //150% gain
                run++; //adds 1 to run
            }
            else //incorrect guess
            {
                System.out.println("You guessed incorrectly.");
                money = money - wager; //wager lost
            }
        }

        //total
        total = (initial + wager) - money;

total = (initial + wager) - money;

我还将程序包含在while循环中（其中boolean cashOut为false），以便用户可以选择在每次滚动后通过现金结束完成游戏（将cashOut更改为true）或者如果pot达到零。 

while(money != 0 && (cashOut = false)) {
}

我设置了printlns，在兑换或游戏结束后，返回正确猜测的数量以及下注和兑现的总金额。

System.out.println("Game over! Thanks for playing!");
System.out.println("Correct guesses = " + run + ".");
System.out.println("Total bet = " + total + ".");
System.out.println("Cashed out = " + money + ".");

然而，现在当向用户询问初始值（10到100之间）时，系统不返回任何内容，无论是否满足验证条件。我试图调试程序6个小时无济于事。任何人都可以发现我的错误吗？

===================

完整代码：

public static void main(String args[]) {
    int run = 0; //correct guesses

    Scanner input = new Scanner (System.in);

    //user's stakes
    System.out.println("How much cash are you betting with today? (Enter int 10 & 100)");
    double initial = input.nextDouble();

    //invalid user stake entry
    while(!(initial < 10 && initial > 100)); 
    {
        System.out.println("Invalid entry"); // print incorrect guess entry input
        System.out.println("Enter between 10 & 100.");
        initial = input.nextInt(); //reset scanner "input"
    }

    boolean cashOut = false;
    double money = initial;
    double total = initial;  

    while(money != 0 && (cashOut = false))
    {
        System.out.println("What is your wager? (to 1 d.p.)");
        double wager = input.nextDouble();

        //roll one
        int rNum1 = (int)(10*Math.random()+1); //declare random roll one,  gives result between 1 and 10

        //print roll one
        System.out.println("You roll the 10-sided die."); 
        System.out.println("It lands on " + rNum1 + "."); //result between 1 and 10
        System.out.println(); //space

        //User guess
        System.out.println("Will a second die roll higher or lower?");
        System.out.println("To guess higher enter [1], or to guess lower, enter [2].");

        //roll two
        int rNum2 = (int)(10*Math.random()+1); //declare random roll two, gives result between 1 and 10
        int guess = input.nextInt(); //user's guess / HiLo

        //invalid user entry
        while(guess != 1 && guess != 2) 
        {
            System.out.println("Invalid entry"); // print incorrect guess entry input
            System.out.println("To guess higher enter [1], or to guess lower, enter [2].");
            guess = input.nextInt(); //reset scanner "input"
        }

        //print roll two
        System.out.println(); //space
        System.out.println("You roll the die again."); 
        System.out.println("It lands on " + rNum2 + "."); //result between 1 and 10
        System.out.println(); //space

        if (guess == 1) //guessed higher
        {
            if (rNum1 == rNum2)
            {
                System.out.println("Draw! Nothing lost, nothing gained!");
            }
            else if (rNum1 > rNum2)
            {
                System.out.println("You guessed incorrectly.");
                money = money - wager; //wager lost
            }
            else
            {
                System.out.println("You guessed correctly!");
                money = money*1.5; //150% gain
                run++; //adds 1 to run
            }
        }

        if (guess == 2) //guessed lower
        {
            if (rNum1 == rNum2)
            {
                System.out.println("Draw! Nothing lost, nothing gained!");
            }
            else if (rNum1 > rNum2)
            {
                System.out.println("You guessed correctly!");
                money = money*1.5; //150% gain
                run++; //adds 1 to run
            }
            else
            {
                System.out.println("You guessed incorrectly.");
                money = money - wager; //wager lost
            }
        }

        //total
        total = (initial + wager) - money;

        //cashout
        System.out.println("To cash out enter [cp]");
        String cashoutChoice = input.next().toLowerCase();
        if (cashoutChoice.equals("cp"))
        {
            cashOut = true;
        }

        System.out.println(); //space
    }

    System.out.println("Game over! Thanks for playing!");
    System.out.println("Correct guesses = " + run + ".");
    System.out.println("Total bet = " + total + ".");
    System.out.println("Cashed out = " + money + ".");
}

}

1 个答案:

答案 0 :(得分：0)

在您的第一个 while 循环中，您已在循环条件结束时放置了分号（;）。删除它，因为这只是强迫事情认为这是而之后的空语句，然后迫使EDT无限期地在此行上循环，直到应用程序被手动强制为关闭。

您的情况也有误。由于您只需要包含10到100之间的值，因此您真正想要的条件是：

while (initial < 10 || initial > 100) { ... }

执行整个循环的更好方法可能是：

//user's stakes
double initial = 0.0;

//invalid user stake entry
while (initial < 10 || initial > 100) {
    System.out.println("How much cash are you betting with today?\n"
                     + "Enter a value between 10 & 100: ");
    initial = input.nextDouble();
    if (initial < 10 || initial > 100) {
        // Print incorrect input entry
        System.err.println("Invalid entry!\n");
        input.nextLine(); // ** Clear Scanner Buffer.
    }
}

如果提供的字母字符不是小数点，最终会抛出 InputMismatchException ，那么这并不能解决问题。 StackOverflow 中很多代码示例，向您展示如何处理此问题。搜索它们。

但是，这只是你问题的一部分。在提供初始赌注值后，您的代码现在将直接转到 游戏结束 ，因为下一个中提供的条件在您的代码中循环，下注提示循环：

boolean cashOut = false;
double money = initial;
double total = initial;

while (money != 0 && (cashOut = false)) { .... }

在 while 循环之上，您声明并将布尔 cashOut 变量初始化为 false ，这很好，但在而< / strong>循环条件你不断强迫提款等于错误，因为你在条件中使用了一个等于（ = ）的字符。 =与==不同，后者应在您的条件中使用：

while (money != 0 && cashOut == false) { .... }

在条件中使用单个等号只会使 cashOut 变量等于后面放置的布尔值（在您的情况下为 false ）。在条件语句中使用==。

这应该让你去。同时考虑不允许用户提供更大的赌注余额。

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