Given Program: The program given in the textbook is given here with comments for better understanding. File Name: TaxReturn.java // Class definition public class TaxReturn { // Declare and initialize the required variables public static final int SINGLE = 1; public static final int MARRIED = 2; private static final double RATE1 = 0.10; private static final double RATE2 = 0.25; private static final double RATE1_SINGLE_LIMIT = 32000; private static final double RATE1_MARRIED_LIMIT = 64000; private double income; private int status; /Constructs a TaxReturn object for a given income and marital status. @param anIncome the taxpayer income @param aStatus either SINGLE or MARRIED / // Method definition public TaxReturn( double anIncome, int aStatus) { income = anIncome; status = aStatus; } // Method definition public double getTax() { // Declare and initialize the required variables double tax1 = 0; double tax2 = 0; /* If the entered status is "Single", compute income tax based on their income / if (status == SINGLE ) { / Check whether the income is less than or equal to $32000 / if (income <= RATE1_SINGLE_LIMIT ) { // If it is, compute the tax tax1 = RATE1 income; } /* If the income is greater than or equal to $32000, compute the tax / else { tax1 = RATE1 RATE1_SINGLE_LIMIT ; tax2 = RATE2 * (income - RATE1_SINGLE_LIMIT ); } } /* If the entered status is "Married", compute income tax based on their income / else { / Check whether the income is less than or equal to $64000 / if (income <= RATE1_MARRIED_LIMIT ) { // If it is, compute the tax tax1 = RATE1 income; } /* If the income is greater than or equal to $64000, compute the tax / else { tax1 = RATE1 RATE1_MARRIED_LIMIT ; tax2 = RATE2 * (income - RATE1_MARRIED_LIMIT ); } } // Return the tax to the main function return tax1 + tax2; } } File Name: TaxCalculator.java // Import the required package import java.util.Scanner; /** This program calculates a simple tax return. / // Class definition public class TaxCalculator { // Main class declaration public static void main(String[] args) { // Create an object for scanner class Scanner in = new Scanner(System. in ); // Prompt the user to enter the income System. out .print("Please enter your income: "); // Store the entered income in the variable double income = in.nextDouble(); // Prompt the user to enter marital status System. out .print("Are you married? (Y/N) "); // Store the entered value in a variable String input = in.next(); // Declare the variable int status; / Check whether the user input value for marital status is "Y" / if (input.equals("Y")) { / If it is "Y", store the taxreturn value for a married person in the variable / status = TaxReturn. MARRIED ; } / Check whether the user input value for marital status is "N" / else { / If it is "N", store the taxreturn value for a single person in the variable */ status = TaxReturn. SINGLE ; } // Create an object for TaxReturn class TaxReturn aTaxReturn = new TaxReturn(income, status); // Display the tax return value based on the user input System. out .println("Tax: " + aTaxReturn.getTax()); } }

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Chapter 3.4, Problem 17SC

Program Plan Intro

Given Program:

The program given in the textbook is given here with comments for better understanding.

File Name: TaxReturn.java

// Class definition

public class TaxReturn

{

    // Declare and initialize the required variables

    public static final int SINGLE = 1;

    public static final int MARRIED = 2;

    private static final double RATE1 = 0.10;

    private static final double RATE2 = 0.25;

    private static final double RATE1_SINGLE_LIMIT = 32000;

    private static final double RATE1_MARRIED_LIMIT = 64000;

    private double income;

    private int status;

/Constructs a TaxReturn object for a given income and marital status.

@param anIncome the taxpayer income

@param aStatus either SINGLE or MARRIED /

    // Method definition

    public TaxReturn(double anIncome, int aStatus)

    {

        income = anIncome;

        status = aStatus;

    }

    // Method definition

    public double getTax()

    {

        // Declare and initialize the required variables

        double tax1 = 0;

        double tax2 = 0;

/* If the entered status is "Single", compute income tax based on their income /

        if (status == SINGLE)

        {

/ Check whether the income is less than or equal to $32000 /

            if (income <= RATE1_SINGLE_LIMIT)

            {

                // If it is, compute the tax

                tax1 = RATE1* * income;

            }

/* If the income is greater than or equal to $32000, compute the tax /

            else

            {

                tax1 = RATE1* * RATE1_SINGLE_LIMIT;

                tax2 = RATE2 * (income - RATE1_SINGLE_LIMIT);

            }

        }

/* If the entered status is "Married", compute income tax based on their income /

        else

        {

/ Check whether the income is less than or equal to $64000 /

            if (income <= RATE1_MARRIED_LIMIT)

            {

                // If it is, compute the tax

                tax1 = RATE1* * income;

            }

/* If the income is greater than or equal to $64000, compute the tax /

            else

            {

                tax1 = RATE1* * RATE1_MARRIED_LIMIT;

tax2 = RATE2 * (income - RATE1_MARRIED_LIMIT);

            }

        }

        // Return the tax to the main function

        return tax1 + tax2;

    }

}

File Name: TaxCalculator.java

// Import the required package

import java.util.Scanner;

/**

This program calculates a simple tax return.

/

// Class definition

public class TaxCalculator

{

    // Main class declaration

    public static void main(String[] args)

    {

        // Create an object for scanner class

        Scanner in = new Scanner(System.in);

        // Prompt the user to enter the income

        System.out.print("Please enter your income: ");

        // Store the entered income in the variable

        double income = in.nextDouble();

        // Prompt the user to enter marital status

        System.out.print("Are you married? (Y/N) ");

        // Store the entered value in a variable

        String input = in.next();

        // Declare the variable

        int status;

/ Check whether the user input value for marital status is "Y" /

        if (input.equals("Y"))

        {

/ If it is "Y", store the taxreturn value for a married person in the variable /

            status = TaxReturn.MARRIED;

        }

/ Check whether the user input value for marital status is "N" /

        else

        {

/ If it is "N", store the taxreturn value for a single person in the variable */

            status = TaxReturn.SINGLE;

        }

        // Create an object for TaxReturn class

        TaxReturn aTaxReturn = new TaxReturn(income, status);

        // Display the tax return value based on the user input

        System.out.println("Tax: "

                + aTaxReturn.getTax());

    }

}

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