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
