Question

有谁知道如何计算循环中的平均值。每次我计算平均值时我都会收到0或1.我知道我需要使用average =（sum）/（salary_annually）;但是我无法让它发挥作用。提前致谢。

 import java.util.Scanner;

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

    int max = Integer.MIN_VALUE;
    int min = Integer.MAX_VALUE;
    int sum = 0;
    int average=0;
    int count = 0;
    int salary_annually = 0;

    for(int employee =1; employee <= 2; employee++)
    {
    System.out.println("Employee: " + employee);

         for(int year=1; year <= 2; year++)
         {

            System.out.println("Please Enter the Salary for Year: "  + year);
              salary_annually = kb.nextInt();

                          sum += salary_annually  ;
              if (min >= salary_annually) 
              { 
                     min = salary_annually;
              } 
             if (max <=salary_annually) 
             { 
               max = salary_annually;
              } 

            average = (sum) / (salary_annually); 


         }

          System.out.println("The average is " + average);
       System.out.println("The higher number  " + max);
       System.out.println("The the lowest number " + min);
     }

   }
  }

Answer 1

我猜这里的问题是你使用的是整数除法。由于总和和一年两次的整数划分工作略有不同。没有余数，因为除以两个整数给出一个int。

例如，1/2不是.5，正如您所料，但它是0.当进行整数运算时，任何小数都会被丢弃。另一个例子是9/5不是1.8，而是1.

如果你想要平均值那么你可以将sum或salary_annually声明为double，并将平均值声明为double。

Answer 2

更改

 average = (sum) / (salary_annually);

要

 double average=0;// Declare it as `double` rather than `int`

 average = (sum) / 2.0;

Answer 3

平均值由：average = sum / count;
您需要增加count变量，否则您将始终获得ArithmeticException / by zero

Answer 4

平均值由average = sum / count计算，其中平均值应为double类型。

您确实声明了变量count，但没有使用它。

import java.util.Scanner;

public class Calulate {

/**
 * @param args
 */
public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);

    int max = Integer.MIN_VALUE;
    int min = Integer.MAX_VALUE;
    int sum = 0;
    double average = 0;
    int count = 2;
    int salary_annually = 0;

    for (int employee = 1; employee <= 2; employee++) {
        System.out.println("Employee: " + employee);

        for (int year = 1; year <= count; year++) {

            System.out.println("Please Enter the Salary for Year: " + year);
            salary_annually = kb.nextInt();
            sum += salary_annually;

            if (min >= salary_annually) {
                min = salary_annually;
            }
            if (max <= salary_annually) {
                max = salary_annually;
            }

        }

        average = sum / count; 

        System.out.println("The average is " + average);
        System.out.println("The higher number  " + max);
        System.out.println("The the lowest number " + min);
    }

}

}

计算嵌套循环Java中的平均数

4 个答案: