Question

程序要求“编写一个Java程序，该程序将首先询问用户他们想要输入多少个等级。然后使用do..while循环用用户输入的等级填充该大小的数组。然后进行排序数组。在for循环中读取该数组，显示成绩并总计成绩。循环后，计算这些成绩的平均值并显示该平均值。

输出是问题。无论我对代码做什么，它只会输出我键入的两个输入。如果我选择输入4,5或10个成绩。它只会显示最低的两个。虽然总数和平均值是正确的。我在这里想念什么？

这是我写的：

import java.util.Scanner;
import java.util.Arrays;

public class TapCoGradeArray
{
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);

        int count;
        double inputGrade = 0;
        double gradeTotal = 0;
        double[] individualGrade; 

        System.out.println("Enter the number of students that are being graded.");
        int numberOfGrades = keyboard.nextInt();

        individualGrade = new double[numberOfGrades];
        count = 0;

        do
        {
            System.out.println("Enter the grade (from 0-100) for each student below.");
            inputGrade = keyboard.nextDouble();
            individualGrade[count] = inputGrade;            
            count++;
            gradeTotal+= inputGrade;

        } while(count < numberOfGrades);

            Arrays.sort(individualGrade);

            for(count = 0; count == individualGrade.length; count++);
            {
                // This next line is using gradeTotal as an array. However, there is no array by that name.
                // Check which array this should be.
                System.out.println("The grades entered are the following: \n" + inputGrade + "\n" + individualGrade[count]);
            }

            double gradeAverage = gradeTotal / numberOfGrades;
            System.out.println("The total of the grades is " + gradeTotal);
            System.out.println("The average of the grades entered is " + gradeAverage);

    }
}

Answer 1

两个主要问题

for(count = 0; count == individualGrade.length; count++);

在达到此值之前，此字符不应该包含seimcolon和循环。

for(count = 0; count < individualGrade.length; count++) 
{
    System.out.println("The grades entered are the following: \n" +
                         inputGrade + "\n" + individualGrade[count]);
}

在使用数组和Java分配中的循环时遇到问题

1 个答案: