java - 如何找到循环内所有测试分数的最高、最低和平均值？

Question

下午好，或者当您阅读本文时。我试图弄清楚如何找到用户输入的测试分数的最小值、最高值和平均值。我有一个循环跟踪哨兵值，在我的例子中是 999。因此，当用户输入 999 时，它会退出循环。我还通过检查用户是否输入超过 100 或低于 0 作为输入来进行一定程度的数据验证。但是，我的问题是，如何实现一种方法来获取此代码来查找用户输入所需的值。我的代码如下:

import java.util.Scanner;
public class TestScoreStatistics 
{

    public static void main(String[] args) 
    {
        Scanner scn = new Scanner(System.in);
        int testScore;
        double totalScore = 0;
        final int QUIT = 999;
        final String PROMPT = "Enter a test score >>> ";
        int lowScore;
        int highScore;
        String scoreString = "";
        int counter = 0;

        System.out.print(PROMPT);
        testScore = scn.nextInt();

        while (testScore != QUIT)
        {

            if (testScore < 0 || testScore > 100 )
            {
                System.out.println("Incorect input field");

            }
            else
            {
                scoreString += testScore + " ";
                counter++;
            }

            System.out.print(PROMPT);
            testScore = scn.nextInt();



        }
        System.out.println(scoreString);
        System.out.println(counter + " valid test score(s)");

    }

}

Answer 1

在保持代码几乎相同的同时，您可以这样做:

import java.util.Scanner;
public class TestScoreStatistics 
{

    public static void main(String[] args) 
    {
        Scanner scn = new Scanner(System.in);
        int testScore;
        double totalScore = 0;
        final int QUIT = 999;
        final String PROMPT = "Enter a test score >>> ";
        int lowScore = 100; //setting the low score to the highest score possible
        int highScore = 0; //setting the high score to the lowest score possible
        String scoreString = "";
        int counter = 0;

        System.out.print(PROMPT);
        testScore = scn.nextInt();

        while (testScore != QUIT)
        {

            if (testScore < 0 || testScore > 100 )
            {
                System.out.println("Incorect input field");

            }
            else
            {
                scoreString += testScore + " ";
                counter++;
                //getting the new lowest score if the testScore is lower than lowScore
                if(testScore < lowScore){
                    lowScore = testScore;
                }
                //getting the new highest score if the testScore is higher than highScore
                if(testScore > highScore){
                    highScore = testScore;
                }
                totalScore += testScore; //adding up all the scores
            }

            System.out.print(PROMPT);
            testScore = scn.nextInt();
         }
        double averageScore = totalScore / counter; //getting the average
     }

这将检查 testScore 是否高于或低于最高分数和最低分数。该程序还将所有分数加在一起，然后除以计数器(即有多少个测试)以获得平均值。