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我想创建一个彩票程序来创建四个随机数，每个随机数介于 0 和 9（含）之间。该程序要求用户猜测四个数字，并将每个用户的猜测与四个随机数进行比较，并将中奖信息显示为：

No matches  0 points
Any one digit matching  5 points
Any two digits matching 100 points
Any three digits matching   2,000 points
All four digits matching    1,000,000 points

我的程序运行但它有一些逻辑错误。例如，输出应该是：

Random numbers:2 3 3 4
Guess numbers: 1 2 5 7-->1 matching digit
Guess numbers: 3 5 7 3-->2 matching digits
Guess numbers: 3 3 3 1-->2 matching digits
Guess numbers: 3 3 3 3-->2 matching digits

public class Lottery
{           
    public static void main(String[] args) {
        final  int LIMIT=10; 
        int totalCount=0;
        int totalPoint;
        Random random=new Random(); //creating object of random class       
        Scanner input=new Scanner(System.in);//creating object of scanner class     
        //declaring two arrays
        int[] guessNumber= new int[4];
        int[] randomNumber=new int[4];       

 for(int i=0;i<4;i++)
   {            

    randomNumber[i]=random.nextInt(LIMIT);//returns value between 0 to 9(inclusive)     
   }     

for(int i=0;i<4;i++)
   {
    System.out.println("Enter your first guess number from 0 to 9:");
    guessNumber[i]=input.nextInt(); 
    } 



for (int i = 0; i < 4; i++)
   {
    for (int j = 0; j < 4; j++) 
      {

        if (randomNumber[i] == guessNumber[j])
           {
        ++totalCount; 
        break; 
        }
       }
   }        

   if(totalCount == 1)
     {
        totalPoint=5;
      }
   else if(totalCount == 2)
     {
        totalPoint=100;
      }
   else if(totalCount == 3)
      {
        totalPoint=2000;
      }
    else if(totalCount == 4)
       {
        totalPoint=100000;
       }    
    else
       {
       totalPoint=0;
       }


//dispalying points 
    System.out.println("You have earned " +totalPoint+ "points!!");
            }
      }
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2 回答 2

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在我看来，问题在于一旦你匹配了一个特定的数字，你应该将它从流通中删除，这样同一值的多次猜测就不会算作匹配。一种解决方案是对randomNumber' 使用 ArrayList 并在匹配时将其删除。如果您用以下内容替换您的// declaring two arrays评论和您的totalPoint作业之间的内容，它似乎按照您的示例执行您的要求。

int guess;
ArrayList<Integer> randomNumber = new ArrayList<Integer>();

for (int i = 0; i < 4; i++) {
   randomNumber.add(random.nextInt(LIMIT));
}

for (int i = 0; i < 4; i++) {
   System.out.print("Enter your guess number from 0 to 9: ");
   guess = input.nextInt();
   for (int j = 0; j < randomNumber.size(); ++j) {
      if (randomNumber.get(j) == guess) {
         ++totalCount;
         randomNumber.remove(j);
         break;
      }
   }
}
input.close();

请注意，我选择在读取每个猜测时对其进行处理，而不是将它们存储在数组中并稍后处理它们。

于 2013-09-27T21:23:54.570 回答
0

看起来你的整体逻辑很好。如果我理解正确，您只需要不同的输出。使用这样的东西作为你的输出。

String guessNumbers = "";
String randomNumbers = "";
for (int i = 0; i < 4; i++){
    randomNumbers += randomNumber[i]+" ";
    guessNumbers += guessNumber[i]+" ";
}
System.out.println("Random numbers: "+randomNumbers);
System.out.println("Guess numbers: "+guessNumbers+" --> # of matching digits "+totalCount);
System.out.println("You have earned " +totalPoint+ " points!!");

这是它现在打印的内容：

Random numbers: 2 9 7 4 
Guess numbers: 7 4 5 2  --> # of matching digits 3
You have earned 2000 points!!
于 2013-09-27T20:27:01.053 回答