java - 计算总和和平均值

Question

我一直在试图解决这个问题，要么我想得太多，要么我只是错过了一些东西。我需要用户输入学生人数，明白了。然后我需要根据用户输入的数字为每个学生输入一个测试成绩。这就是我被困住的地方。然后我需要根据这些测试成绩计算总和，并计算平均值。任何帮助将不胜感激。到目前为止我有这个:

import java.util.*;

public class computeSumAverage {

    public static void main(String[] args) {

        Scanner kbd = new Scanner(System. in );

        System.out.print("Please enter the number of students = ");

        int student = kbd.nextInt();

        System.out.print("Please enter " + student + " test grades = ");

        int count;
        double grades = kbd.nextDouble();
        double sum = kbd.nextDouble();
        double average;

        for (count = 0; count <= 100; count++);

        sum = (grades++);

        average = (sum / student);

        System.out.println("The sum of the numbers is = " + sum + "." + "\n");
        System.out.println("The average of the numbers is = " + average + ".");
    }
}

Answer 1

试试这个。它应该可以工作。

public static void main (String[] args) {

    Scanner kbd = new Scanner (System.in);

    System.out.print ("Please enter the number of students = ");    

    int count = kbd.nextInt();

    double sum = 0;
    double average = 0;;

    for (int student = 0; student < count; student ++){

        System.out.print ("Please enter Student: " + String.valueOf(student +1) + " test grades = ");

        double grades = kbd.nextDouble();

        sum += grades;

    }

    average = (sum / count); 

    System.out.println ("The sum of the grades is = " + sum + "." + "\n");  
    System.out.println ("The average of the grades is = " + average + ".");

 }

你的代码有什么问题。

1. 在 for 循环中是没有用的，因为它不能帮助你实现你想要做的事情，而 ;立即停止它。循环没有核心。您应该循环计算您拥有的学生数量。

2. 在循环内，您应该读取成绩并提示用户输入每个学生的成绩。

3. 我猜你并没有真正尝试过。

4. 在编码之前您应该思考您正在做的事情。