java - Sum 和 Average 给出不正确的输出

Question

我有这段计算总和和平均值的代码，但它给出了错误的计算结果。你知道为什么吗？

import java.util.Scanner;

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

       System.out.print("Enter a lower bound then an upper bound:");

       double sum = 0;
       double average;
       int lowerbound = input.nextInt();
       int upperbound = input.nextInt();

       System.out.println("The upper bound " + upperbound);

       for(int number = lowerbound; number <= upperbound; number++) {
           sum += number;
       }

       average = sum/upperbound;
       System.out.println("The sum is " +sum);
       System.out.println("The average is " + average);
   }
}

Answer 1

要获得正确的平均值，您必须将总和除以元素数。

因此平均值不是:

average = sum/upperbound;

它是:

average = sum/(upperbound-lowerbound+1);