Question

在我的程序中，我试图让用户输入不确定数量的等级，介于0和100之间，如果它低于0或超过100，则会出现错误消息，直到用户输入＆＃34; 999＆＃34;，然后显示输入的成绩数，最高数字，最低数字和平均数。

我让程序中的所有内容都有效，但我无法弄清楚如何排除＆＃34; 999＆＃34;结束了用户能够输入最高等级和平均值的数字。

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，我将以无限循环开始，检查999和有效性，然后递增值（并更新highest和lowest等）。像，

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);
}

如何排除计算最高数字和平均数的范围内的输入数字？

1 个答案: