第六章第三十题（游戏：双骰子赌博）(Game: craps)

第六章第三十题（游戏：双骰子赌博）(Game: craps)

• **6.30（游戏：双骰子赌博）执双骰子游戏是赌场中非常流行的骰子游戏。编写程序，玩这个游戏的一个变种，如下所描述： 执两个骰子。每个骰子有六个面，分别表示值1，2，…，6。检查这两个骰子的和。如果和为2、3或12（称为掷骰子（crap））,你就输了；如果和是7或者11（称作自然(natural)）,你就赢了；但如果和是其他数字（例如：4、5、6、8、9或者10），就确定了一个点。继续掷骰子，直到掷出一个7或者掷出和刚才相同的点数。如果掷出的是7，你就输了。如果掷出的点数和你前一次掷出的点数相同，你就赢了。程序扮演一个独立的玩家。
  下面是一些运行示例：
  You rolled 5 + 6 = 11
  You win
  You rolled 1 + 2 = 3
  You lose
  You rolled 4 + 4 = 8
  point is 8
  You rolled 6 + 2 = 8
  You win
  You rolled 3 + 2 = 5
  point is 5
  You rolled 2 + 5 = 7
  You lose
  **6.30(Game: craps)Craps is a popular dice game played in casinos. Write a program to play a variation of the game, as follows:Roll two dice. Each die has six faces representing values 1, 2, . . ., and 6, respectively. Check the sum of the two dice. If the sum is 2, 3, or 12 (called craps), you lose; if the sum is 7 or 11 (called natural), you win; if the sum is another value (i.e., 4, 5, 6, 8, 9, or 10), a point is established. Continue to roll the dice until either a 7 or the same point value is rolled. If 7 is rolled, you lose. Otherwise, you win. Your program acts as a single player.
  Here are some sample runs.
  You rolled 5 + 6 = 11
  You win
  You rolled 1 + 2 = 3
  You lose
  You rolled 4 + 4 = 8
  point is 8
  You rolled 6 + 2 = 8
  You win
  You rolled 3 + 2 = 5
  point is 5
  You rolled 2 + 5 = 7
  You lose
• 参考代码：

package chapter06;

public class Code_30 {
    
    
    public static void main(String[] args) {
    
    
        int point;
        int firstDie = rollDie();
        int secondDie = rollDie();
        int sumOfTwoDice = firstDie + secondDie;

        if(sumOfTwoDice == 2 || sumOfTwoDice == 3 || sumOfTwoDice == 12)
        {
    
    
            System.out.printf("You rolled %d + %d = %d\n",firstDie,secondDie,sumOfTwoDice);
            System.out.println("You lose");
        }
        else if(sumOfTwoDice == 7 || sumOfTwoDice == 11)
        {
    
    
            System.out.printf("You rolled %d + %d = %d\n",firstDie,secondDie,sumOfTwoDice);
            System.out.println("You win");
        }
        else
        {
    
    
            point = sumOfTwoDice;
            System.out.printf("You rolled %d + %d = %d\n",firstDie,secondDie,sumOfTwoDice);
            System.out.printf("point is %d\n", point);
            do {
    
    
                firstDie = rollDie();
                secondDie = rollDie();
                sumOfTwoDice = firstDie + secondDie;
            }while(sumOfTwoDice !=7 && sumOfTwoDice != point);

            System.out.printf("You rolled %d + %d = %d\n",firstDie,secondDie,sumOfTwoDice);
            if(sumOfTwoDice == point)
                System.out.println("You win");
            else if(sumOfTwoDice == 7)
                System.out.println("You lose");
        }
    }
    public static int rollDie() {
    
    
        return (int)(Math.random() * 6 + 1);
    }
}

• 结果显示：

You rolled 4 + 5 = 9
point is 9
You rolled 1 + 6 = 7
You lose

Process finished with exit code 0