java - 数字分析程序

Question

我正在参加 Java 初学者类(class)，刚刚学习数组的概念。我们必须使用注释来表示代码。

我正在尝试编写一个程序，要求用户输入20个数字，将它们存储在一个数组中，然后计算并显示:最小数字、最大数字、数字总数和数字平均值。

通过 jGrasp 运行时出现大量错误，并且不确定如何修复它们。

有什么建议吗？

public class NumberAnalysisProgram
{
  public static void main (String[] args)
  {


  Scanner input = new Scanner (System.in);

  //A constant for the array size
  final int SIZE = 20;

  //Declare an array to hold the numbers entered by the user
  int[] numbers = new int[SIZE];

  //Declare variables to hold the lowest and highest
  int lowest = numbers[0];
  int highest = numbers[0];

  //Declare variable to hold the total
  int sum;

  //Declare a variable to hold the average
  double average;

  //Declare a counting variable to use in the loops
  int index = 0;

  //Explain the program
  System.out.println("This program gets a list of 20 numbers. Then displays:");
  System.out.println(" the lowest number, the highest number, the total of the numbers,     
  and the average.");

  //Get the numbers from the user
  for (int i = 0; i< numbers.length; i++)
  {
  System.out.print("Please enter 20 numbers, each seperated by a space:  ");
  numbers[i] = input.nextInt();
  }


  //Call a method to calculate the lowest and highest numbers
  getLowHigh(numbers);

  //Display the lowest and highest numbers
  System.out.println("The lowest number is:  " + lowest);
  System.out.println("The highest number is:  " + highest);



  //Call a method to calculate the total of the numbers
  sum = getTotal(numbers);

  //Display the sum/total of the numbers
  System.out.println("The total of these numbers are:  " + sum);



  //Call a method to calculate the average of the numbers
  average = getAverage(sum, numbers);

  //Display the average of the numbers
  System.out.println("The average of these numbers are:  " + average);

 }


  //Method getLowHigh
  public static int getLowest(int[] array)
  {
     for(int i=1; i< numbers.length; i++)
     {
          if(numbers[i] > highest)
          highest = numbers[i];
       else if (numbers[i] < lowest)
       lowest = numbers [i];
     }

     return highest;
     return lowest;   
  }

  //Method getTotal
  public static int getTotal(int[] array)
  {

  //Loop counter variable
  int index;

  //Accumulator variable initialized to 0
  int total = 0;

  //Pull in the numbers from the main method to calculate the total
  for(index = 0; index < numbers.length; index++)
  {
     total = total + number[index];
  }

     return total;  
  }

  //Method getAverage
  public static int getAverage(int[] array)
  {

     //Loop counter variable
     int index;


     //Pull in the sum and the numbers from the main method to calculate the average
     for(index = 0; index < numbers.length; index++)
     {
        average = sum / number[index];
     }

     return average;  
   }
}

Answer 1

我看到的第一个问题是，在所有方法中，您从未使用过参数。您使用了不同的数组，该数组不存在于这些方法中。

第二个问题是您试图从一个方法返回两个值。一种方法只能返回一个值。因此，您必须去掉“return最高;”并复制没有“returnlowest;”的方法，并在需要的地方使用每个方法。

我看到的第三件事(尽管它不会导致任何错误)是您可以通过说来缩短代码

int total = 0;

for(int index = 0; index < numbers.length; index++)
{
   total += number[index];
}

而不是

int index;

int total = 0;

for(index = 0; index < numbers.length; index++)
{
   total = total + number[index];
}