java - 创建彩票

Question

生成三位数的彩票。程序提示用户输入一个三位数根据以下规则判断用户是否获胜:(规则1)。如果用户输入的彩票号码与抽奖号码的顺序完全匹配，则奖励为10,000 美元。(规则 2)。如果用户输入的所有数字都与彩票号码中的所有数字匹配，则奖励为3,000 美元。(规则 3)。如果用户输入的一位数字与彩票号码中的一位数字匹配，则奖励为1,000 美元。

我需要帮助让我的程序按照代码中看到的所有内容正常运行。没有数组，没有字符串，除了已经存在的东西之外什么都没有。我的问题是，我无法猜测 110 来忽略规则 2。我将其设置为 100 来测试所有规则。

import java.util.Scanner;

public class NewClass {
    public static void main(String[] args) {
        int lottery = 100;

 // Prompt the user to enter a guess
        Scanner input = new Scanner(System.in);
        System.out.print("Enter your lottery pick (three digits): ");
        int guess = input.nextInt();

 // Get digits from lottery
        int lotteryDigit1 = lottery / 100;
        int lotteryDigit2 = (lottery % 100) / 10;
        int lotteryDigit3 = lottery % 10;

 // Get digits from guess
        int guessDigit1 = guess / 100;
        int guessDigit2 = (guess % 100) / 10;
        int guessDigit3 = guess % 10;

        System.out.println("The lottery number is " + lottery);

 // RULE1 Check the guess
        if (guess == lottery)
            System.out.println("Exact match: you win $10,000");
 // RULE2   
        else if ((guessDigit1 == lotteryDigit1
            || guessDigit1 == lotteryDigit2 
            || guessDigit1 == lotteryDigit3)
            && (guessDigit2 == lotteryDigit1
            || guessDigit2 == lotteryDigit2
            || guessDigit2 == lotteryDigit3)
            && (guessDigit3 == lotteryDigit1
            || guessDigit3 == lotteryDigit2
            || guessDigit3 == lotteryDigit3))
            System.out.println("Match all digits: you win $3,000");
    // RULE3
        else if ((guessDigit1 == lotteryDigit1
            || guessDigit1 == lotteryDigit2
            || guessDigit1 == lotteryDigit3)
            || (guessDigit2 == lotteryDigit1
            || guessDigit2 == lotteryDigit2
            || guessDigit2 == lotteryDigit3)
            || (guessDigit3 == lotteryDigit1
            || guessDigit3 == lotteryDigit2
            || guessDigit3 == lotteryDigit3))   
            System.out.println("Match one digit: you win $1,000");

        else
            System.out.println("Sorry, no match");
    }
 }

更新:

import java.util.Scanner;
    public class NewClass {
        public static void main(String[] args) {
        int lottery = 456;

 // Prompt the user to enter a guess
        Scanner input = new Scanner(System.in);
        System.out.print("Enter your lottery pick (three digits): ");
        int guess = input.nextInt();

 // Get digits from lottery
        int lotteryDigit1 = lottery / 100;
        int lotteryDigit2 = (lottery % 100) / 10;
        int lotteryDigit3 = lottery % 10;

 // Get digits from guess
        int guessDigit1 = guess / 100;
        int guessDigit2 = (guess % 100) / 10;
        int guessDigit3 = guess % 10;

        System.out.println("The lottery number is " + lottery);

  // Sum up both sets of digits to compare for 3 inconsecutive matches
        int guessSum = guessDigit1 + guessDigit2 + guessDigit3;
        int lotterySum = lotteryDigit1 + lotteryDigit2 + lotteryDigit3;

 // RULE1 Check the guess
        if (guess == lottery)
            System.out.println("Exact match: you win $10,000");
 // RULE2   
        else if ((guessDigit1 == lotteryDigit1
            || guessDigit1 == lotteryDigit2 
            || guessDigit1 == lotteryDigit3)
            && (guessDigit2 == lotteryDigit1
            || guessDigit2 == lotteryDigit2
            || guessDigit2 == lotteryDigit3)
            && (guessDigit3 == lotteryDigit1
            || guessDigit3 == lotteryDigit2
            || guessDigit3 == lotteryDigit3)
            && guessSum == lotterySum)      
            System.out.println("Match all digits: you win $3,000");
// RULE3
        else if ((guessDigit1 == lotteryDigit1
            || guessDigit1 == lotteryDigit2
            || guessDigit1 == lotteryDigit3)
            || (guessDigit2 == lotteryDigit1
            || guessDigit2 == lotteryDigit2
            || guessDigit2 == lotteryDigit3)
            || (guessDigit3 == lotteryDigit1
            || guessDigit3 == lotteryDigit2
            || guessDigit3 == lotteryDigit3))   
            System.out.println("Match one digit: you win $1,000");

        else
            System.out.println("Sorry, no match");
    }
 }

这似乎最有效。我一直在循环使用数字来检验我的猜测。我没有遇到过错误的猜测。 &&guessSum == lotterySum) 仅与 RULE2 一起使用。

Answer 1

规则 2 的条件是错误的；它当前说(以伪代码):

IF  guessDigit1 is anyLotteryDigit
AND guessDigit2 is anyLotteryDigit
AND guessDigit3 is anyLotteryDigit

这显然不是您想要的，因为这意味着多个猜测数字可以匹配同一个彩票数字，就像您遇到的 110 匹配 100 code> - 由于 1 和 0 都在中奖号码中，因此即使不应该通过，它也会通过。

相反，您希望将每个数字与剩余数字相匹配。执行此操作的“正确”方法是使用 Set ，但听起来你还不能使用它们。你可以手动完成，只需要把所有的情况都写出来就行了。基本上，您将猜测的一位数字与彩票的一位数字进行比较，然后将剩余的两个猜测数字与剩余的两个彩票数字进行比较。对每个数字重复冲洗。