Chapter 8, Problem 12PE

a.

Explanation of Solution

Program:

File name: “DrugTests2.java”

//Define a class named DrugTests2

public class DrugTests2

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare the variables and initialize the values

        int testedEmployee;

        int week;

        final int WEEKS = 52;

        final int EMPLOYEES = 30;

        int[] counts = new int[EMPLOYEES];

        int countNeverTested = 0;

        int x;

        /*For loop to be executed until a list of randomly

        selected employees who will be tested each

        week for the next 52 weeks*/

        for(week = 1; week <= WEEKS; ++week)

        {

            //Calculate the number of times each employee is selected

            testedEmployee = 1 + (int) (Math.random() * EMPLOYEES);

            //Print the result

            System.out.print("week " + week + " Emp # " +

            testedEmployee + "      ");

            //If remainder of week % 4 equals 0

            if(week % 4 == 0)

                //Print the result

                System.out.println();

                //Increment counts

                counts[testedEmployee - 1]++;

        }

        //For loop to be executed until x exceeds 30

        for(x = 0; x < EMPLOYEES; ++x)

        {

            //Print the result

System...

b.

Explanation of Solution

Program:

File name: “DrugTests3.java”

//Define a class named DrugTests3

public class DrugTests3

{

    //Define a main method

    public static void main(String[] args)

    {

        //Declare the variables and initialize the values

        int testedEmployee;

        int week;

        final int WEEKS = 52;

        final int EMPLOYEES = 30;

        int[] counts = new int[EMPLOYEES];

        int countNeverTested = 0;

        int x;

        int previousEmployee = -1;

        /*For loop to be executed until a list of randomly

        selected employees who will be tested each

        week for the next 52 weeks*/

        for(week = 1; week <= WEEKS; ++week)

        {

/*Calculate the number of times each employee is selected*/

testedEmployee = 1 + (int) (Math.random() * EMPLOYEES);

            /*If an employee number is selected

            immediately after it was already selected*/

            if(testedEmployee == previousEmployee)

            {

                //Decrement week

                week--;

                //Print the result

                System.out.println("Employee #" + testedEmployee + " was selected two weeks in a row -- making new selection");

            }

            //Else

            else

            {

                //Print the result

                System.out.print("week " + week + " Emp # " +

                testedEmployee + "      ");

                //If remainder of week % 4 equals 0

                if(week % 4 == 0)

                    //Print the result

                    System...