java - 我的所有输出都收到 0

Question

所需输出:

Total: 55.0
Average: 5.5
Minimum Value: 1.0
Maximum Value: 10.0
The data being used is: [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0]

我的代码是

import java.util.*;
import java.io.*;

public class CH8_11 {

//Constants Declaration
//*********************

public static void main(String[] args) throws FileNotFoundException 
{
    // TODO Auto-generated method stub

    //Variable Declaration Section
    //****************************
    int[] numbers;
    int SIZE;
    int i;
    int max;
    int min;
    int total;
    double average;





    // Variables Initialization Section
    //*********************************
    File file = new File("C:\\testing1.txt");
    Scanner scanner = new Scanner(file);
    SIZE = 0;
    max = 0;
    min = Integer.Max_VALUE;
    i = 0;
    total = 0;
    average = 0.0;



    //Keyboard
    //********



    // Code Section
    //*************
    while(scanner.hasNext())
    {
        SIZE++;
        scanner.next();
    }

    while(scanner.hasNext() && i < numbers.length)
    {
        numbers[i] = scanner.nextInt();
        i++;
    }

    for(int j = 1; j < numbers.length; j++)
    {
        if(numbers[j] > max)
            max = numbers[j];
    }

    for(int j = 1; j < numbers.length; j++)
    {
        if(numbers[j] < min)
            min = numbers[j];
    }

    for(int j = 0; j < numbers.length; j++)
    {
        total += numbers[j];
        average = total / (double)numbers.length;
    }





    //Output Section
    //**************
    System.out.println("Numbers being used: "+ java.util.Arrays.toString(numbers));
    System.out.print("---------------------------------------------------");
    System.out.print("\nMaximum Value: " + max);
    System.out.print("\n-----------------");
    System.out.print("\nMinimum Value: " + min);
    System.out.print("\n-----------------");
    System.out.print("\nAverage: " + average);
    System.out.print("\n-----------------");
    System.out.print("\nTotal: " + total);




    //Resource Cleaning
    //*****************
    scanner.close();




}

}

感谢社区的帮助，我已经修复了我的最小值解决方案。我根据下面评论之一的建议修改了我的代码，该建议允许数组变为文件的大小，因此它不是固定的大小。但现在我收到的所有输出都是 0，我不明白为什么。

Answer 1

不要将您的min初始化为

min = numbers[0];

这会在此处放置一个0，并且必然是给定数组值的最小值。将其初始化为 Integer.MAX_VALUE

min = Integer.MAX_VALUE;

或者，只需使用您在循环之前计算出的可用最大值，例如

for(int j = 0; j < numbers.length; j++)
{
    if(numbers[j] > max)
        max = numbers[j];
}

min = max;
for(int j = 0; j < numbers.length; j++)
{
    if(numbers[j] < min)
        min = numbers[j];
}

另请注意，您需要使用 int j = 0 开始迭代。否则，您的代码在计算最大值和最小值时会忽略第一个数组值。

---

计算文件中可用整数的数量

File file = new File("C:\\testing1.txt");
Scanner scanner = new Scanner(file);

SIZE = 0;

// count the numbers
while(scanner.hasNext()) {
  SIZE++;
  scanner.next()
}

numbers = new int[SIZE];

// reopen the scanner
scanner.close();
scanner = new Scanner(file);