第三章第十五题（游戏：彩票）(Game: lottery)

• **3.15（游戏：彩票）修改程序清单3-8，产生三位整数的彩票。程序提示用户输入一个三位整数，然后依照下面判定用户是否赢得奖金：

1. 如果用户输入的所有数包括顺序完全匹配彩票数字，奖金是10000美元。

2. 如果用户输入的所有数匹配彩票的所有数字，奖金是3000美元。

3. 如果用户输入的其中一个数匹配彩票号码中的一个数，奖金是1000美元。

   **3.15(Game: lottery) Revise Listing 3.8, Lottery.java, to generate a lottery of a three-digit number. The program prompts the user to enter a three-digit number and determines whether the user wins according to the following rules:

4. If the user input matches the lottery number in the exact order, the award is
   $10,000.

5. If all digits in the user input match all digits in the lottery number, the award
   is $3,000.

6. If one digit in the user input matches a digit in the lottery number, the award
   is $1,000.

• 参考代码：

package chapter03;import java.util.Scanner;public class Code_15 {public static void main(String[] args) {int guess, guessDigit1, guessDigit2, guessDigit3;final int lotteryDigit1, lotteryDigit2, lotteryDigit3;// Generate a lottery numberfinal int lottery = (int)(Math.random() * 1000);// Prompt the user to enter a guessSystem.out.print("Enter your lottery pick (three digits): ");Scanner input = new Scanner(System.in);guess = input.nextInt();// Get digits from guessguessDigit1 = guess / 100;guessDigit2 = guess % 100 / 10;guessDigit3 = guess % 10;// Get digits from lotterylotteryDigit1 = lottery / 100;lotteryDigit2 = lottery % 100 / 10;lotteryDigit3 = lottery % 10;// Check the guessif(lottery == guess)System.out.println("Exact match:you win $10000");else if((lotteryDigit1 == guessDigit1 && lotteryDigit2 == guessDigit3 && lotteryDigit3 == guessDigit2)||(lotteryDigit1 == guessDigit2 && lotteryDigit2 == guessDigit1 && lotteryDigit3 == guessDigit3)||(lotteryDigit1 == guessDigit2 && lotteryDigit2 == guessDigit3 && lotteryDigit3 == guessDigit1)||(lotteryDigit1 == guessDigit3 && lotteryDigit2 == guessDigit1 && lotteryDigit3 == guessDigit2)||(lotteryDigit1 == guessDigit3 && lotteryDigit2 == guessDigit2 && lotteryDigit3 == guessDigit1)){System.out.println("Match all digits:you win $3000");}else if(lotteryDigit1 == guessDigit1 || lotteryDigit1 == guessDigit2 || lotteryDigit1 == guessDigit3||lotteryDigit2 == guessDigit1 || lotteryDigit2 == guessDigit2 || lotteryDigit2 == guessDigit3||lotteryDigit3 == guessDigit1 || lotteryDigit3 == guessDigit2 || lotteryDigit3 == guessDigit3){System.out.println("Match one digit:you win $1000");}else{System.out.println("Sorry,no match");}input.close();}
}

• 结果显示：

Enter your lottery pick (three digits): 698
Match one digit:you win $1000Process finished with exit code 0