Chapter 9, Problem 2PE

a.

Explanation of Solution

Program:

File name: “MeanMedian.java”

//Import necessary header files

import javax.swing.*;

//Define a class named MeanMedian

class MeanMedian

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare an array of nine integers

        int[] nums = new int[9];

        //Declare the variables and initialize the values

        String entry;

        String list = "You entered: ";

        int a, b;

        int temp;

        int midPos;

        int total = 0;

        double mean;

        //For loop to be executed until a exceeds 9

        for(a = 0; a < nums.length; ++a)

        {

            //Prompt the user to enter a number

            entry = JOptionPane.showInputDialog(null,

           "Enter number " + (a + 1));

            nums[a] = Integer.parseInt(entry);

            //Compute the total

            total += nums[a];

            //If a equals zero

            if(a == 0)

                //Find the list

                list += nums[a];

            //Else a not equals zero

            else

                //Find the list

                list += ",  " + nums[a];

        }

        //Print the result

        System...

b.

Explanation of Solution

Program:

File name: “MeanMedian2.java”

//Import necessary header files

import javax.swing.*;

//Define a class named MeanMedian2

class MeanMedian2

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare an array of 20 integers

        int[] nums = new int[20];

        //Declare the variables and initialize the values

        int num = 0;

        String entry;

        String list = "You entered: ";

        int a, b;

        int temp;

        double median;

        int total = 0;

        double mean = 0;

        final int QUIT = 9999;

        int size = 0;

        /*For loop to be executed until a exceeds 20 and does not enter QUIT*/

        for(a = 0; num != QUIT && a < nums.length; ++a)

        {

            //Prompt the user to enter a number or QUIT

            entry = JOptionPane.showInputDialog(null,

"Enter number " + (a + 1) + " or " + QUIT + " to quit");

            num = Integer.parseInt(entry);

            //If the user does not enter QUIT

            if(num != QUIT)

            {

                //Assign the value

                nums[a] = num;

                //Find the total

                total += nums[a];

                //If a equals zero

                if(a == 0)

                    //Find the list

                    list += nums[a];

                //Else

                else

                    //Find the list

                    list += ",  " + nums[a];

            }

        }

        //Print the result

        System.out.println("size is " + a);

        //If the user does not enter QUIT

        if(num != QUIT)

            //Find the size

            size = nums...