java - 如何从计算最高数和平均值中排除某个范围内的输入数？

Question

在我的程序中，我试图让用户输入不确定数量的成绩，介于 0 和 100 之间，如果低于 0 或超过 100，它会显示错误消息，直到用户输入“999”，然后显示输入的分数、最高分数、最低分数和平均分数。

程序中的所有内容都可以正常工作，但是我无法弄清楚如何排除“999”，该“999”结束了用户能够输入最高等级和平均等级的数字。

这是我的代码:

import java.util.Scanner;

public class TestScoreStatistics
{
public static void main(String[] args)
{
  int numberOfScores = 0;
  int highest = 0;
  int lowest = 100;
  double average;
  Integer score = 0;
  int sumOfScores = 0;

  Scanner input = new Scanner(System.in);

  System.out.println("Please enter a grade or enter 999 to finish >> ");
  score = input.nextInt();
  sumOfScores = sumOfScores + score;


     while (score != 999 && score <= 100 && score >= 0)
     {

      System.out.println("Please enter a grade or enter 999 to finish >> ");
      score = input.nextInt();
      sumOfScores = sumOfScores + score;
      ++numberOfScores;
      if(score > highest){
      highest=score;}
      else if(score<lowest){
      lowest=score;}
     }
        while (score != 999 && score > 100 || score < 0)
        {
            System.out.println("You entered an invalid score. Please enter a valid test score.");
            System.out.println("Please enter a grade or enter 999 to finish >> ");
            score = input.nextInt();
            sumOfScores = sumOfScores + score;

        }
             if (score == 999)
             {
             System.out.println("Number of Scores you entered: " + numberOfScores);
             System.out.println("Highest Score: " + highest);
             System.out.println("Lowest Score: " + lowest);
             average = sumOfScores / numberOfScores;
             System.out.println("Average Score: " + average);
             }
  }
}

Answer 1

你有两个额外的循环，我会从一个无限循环开始，检查 999 和有效性，然后增加值(并更新 highest 和 lowest 等)。喜欢，

public static void main(String[] args) {
    int numberOfScores = 0, highest = 0, lowest = 100;
    int sumOfScores = 0;

    Scanner input = new Scanner(System.in);
    while (true) {
        System.out.println("Please enter a grade or enter 999 to finish >> ");
        int score = input.nextInt();
        if (score == 999) {
            break; // <-- end the loop
        } else if (score > 100 || score < 0) {
            System.out.println("You entered an invalid score. " 
                    + "Please enter a valid test score.");
        } else {
            sumOfScores += score;
            numberOfScores++;
            highest = Math.max(highest, score);
            lowest = Math.min(lowest, score);
        }
    }
    System.out.println("Number of Scores you entered: " + numberOfScores);
    System.out.println("Highest Score: " + highest);
    System.out.println("Lowest Score: " + lowest);
    double average = sumOfScores / (double) numberOfScores;
    System.out.println("Average Score: " + average);
}