Java 数组中 max 和 min 的代码

Question

我的项目是关于查找学生成绩的平均值、最小值和最大值以及他们的排名，但它一直向我显示输出错误。

<小时/>

以下是姓名和成绩:

学生们:

Alia Nahid Eiman Suad Lamia Salma Mai Wedad Haya Sanaa

测验:

10 20 50 70 80 50 30 90 60 40

期中考试:

30 80 100 40 80 70 70 80 50 30

期末考试:

40 80 70 100 90 60 70 50 40 80

<小时/>

这是 Java 代码:

package java_final_project;

import java.util.*;

public class Java_Final_Project {
    static Scanner console = new Scanner(System.in);

    public static void main(String[] args) {
        // Declare inputs:
        String letter1, letter2, letter3;
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;

        // Declare the four array structures
        int[] quiz = new int[10];
        int[] midterm = new int[10];
        int[] finalexam = new int[10];
        String[] students = new String[10];  

        // Input elements to the arrays
        int counter, sum1 = 0;
        int sum2 = 0;
        int sum3 = 0;
        double ave1, ave2, ave3;
        int max1, max2, max3;
        int min1, min2, min3;

        for (counter = 0; counter < 10; counter++) {
            System.out.println ("Enter student names and grades of quiz, midterm "
                + "and final with space between them");
            students[counter] = console.next();
            quiz[counter] = console.nextInt();
            sum1 = sum1 + quiz[counter];
            midterm[counter]= console.nextInt();
            sum2 = sum2 + midterm[counter];
            finalexam[counter]= console.nextInt();
            sum3 = sum3 + finalexam[counter];
        }

        ave1 = sum1 / 10;
        ave2 = sum2 / 10;
        ave3 = sum3 / 10;

        // min and max values
        max1 = Math.max(quiz[counter], max);
        max2 = Math.max(midterm[counter], max);
        max3 = Math.max(finalexam[counter], max);

        min1 = Math.min(quiz[counter], min);
        min2 = Math.min(midterm[counter], min);
        min3 = Math.min(finalexam[counter], min);

        // if statement for the standing
        // ave1
        if (ave1 >= 90 && ave1 <= 100) {
            letter1 = "E";
        } else if (ave1 >= 70 && ave1 <= 80) {
            letter1 = "G";
        } else if (ave1 >= 50 && ave1 <= 60) {
            letter1 = "S";
        } else {
            letter1 = "P";
        }

        // ave2
        if (ave2 >= 90 && ave2 <= 100) {
            letter2 = "E";
        } else if (ave2 >= 70 && ave2 <= 80) {
            letter2 = "G";
        } else if (ave2 >= 50 && ave2 <= 60) {
            letter2 = "S";
        } else {
            letter2 = "P";
        }

        //ave3
        if (ave3 >= 90 && ave3 <= 100) {
            letter3 = "E";
        } else if (ave3 >= 70 && ave3 <= 80) {
            letter3 = "G";
        } else if (ave3 >= 50 && ave3 <= 60) {
            letter3 = "S";
        } else {
            letter3 = "P";
        }

        // Display the elements of the four arrays  
        System.out.println("Here is the elements of the four arrays");
        System.out.println("students" + "\t" + "quiz" + "\t" + "midterm" + "\t" + "finalexam");
        for (counter = 0; counter < 10; counter++) {
            System.out.println(students[counter] + "\t" + quiz[counter] + "\t" + midterm[counter] + "\t" + finalexam[counter]);
        }
        System.out.println("Summary Report:");
        System.out.println();
        System.out.println("students" + "\t" + "\t" + "Quiz" + "\t" + "\t" + "Midterm" + "\t" + "\t" + "FinalExam");
        System.out.println();
        System.out.println("Average" + "\t" + "\t" + ave1 + "\t" + "\t" + ave2 + "\t" + "\t" + ave3);
        System.out.println();
        System.out.println("Max" + "\t" + "\t" + max1 + "\t" + "\t" + max2 + "\t" + "\t" + max3);
        System.out.println();
        System.out.println("Min" + "\t" + "\t" + min1 + "\t" + "\t" + min2 + "\t" + "\t" + min3);
        System.out.println();
        System.out.println("Standing" + "\t" + "\t" + letter1 + "\t" + "\t" + letter2 + "\t" + "\t" + letter3);
    }
}

Answer 1

设置 min1、min2、min3、max1、max2、max3 的六行需要位于收集输入的 for 循环内；因为您想在每次输入后检查它是否大于或小于当前的最大值和最小值。目前，如果您有这些行，它们将无法工作，因为 counter 不再指向数组中的条目。