CSC 171 - Introduction to Structured Programming

Assignment #28 - Writing an ArrayStuff class (EXTRA CREDIT)

Due Friday, May 15, 2017

In class, we wrote a class that used arrays. We are going to take the methods readArray(), calcAverage() and writeArray() and turn them into a separate class.

Write a class called TestArray that contains main.

For extra credit, include the array and its actual size in the class. Below you will find the class ArrayAverage:

import java.util.Scanner;

public class AverageArray {
  // Read in an array and calculate and print its average
  public static void main(String[] args)  {
    int [] myArray = new int[9];
    
    readArray(myArray);
    double average = calcAverage(myArray);
    System.out.printf("The average is %4.1f\n", average);
    writeArray(myArray);
  }
  
  // readArray() - Read in the array
  public static void readArray(int[] x)  {
    Scanner keyb = new Scanner(System.in);
    int index;
    
    for (index = 0;  index < 9;  index++)  {
      System.out.println("Enter x[" + index + "]");
      x[index] = keyb.nextInt();
    }
  }
  
  // calcAverage() - Calculate and return the average
  //                 of an array
  public static double calcAverage(int[] x)  {
    int index;
    double sum = 0.0;
    
    for (index = 0;  index < 9;  index++)
      sum = sum + x[index];

    return sum / 9;
  }
  
  // writeArray() - Print the array
  public static void writeArray(int[] x) {
    int index;
    
    for (index = 0;  index < 9;  index++)
      System.out.println("x[" + index + "] = " + x[index]);
  }
}

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