Chapter 6 Exercise 15, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

6.15 (Financial application: print a tax table) Listing 3.5 gives a program to compute tax. Write a method for computing tax using the following header:

 public static double computeTax(int status, double taxableIncome)

Use this method to write a program that prints a tax table for taxable taxableIncome from $50,000 to $60,000 with intervals of $50 for all the following statuses:

Taxable    Single                   Married Joint                       Married           Head of
Income                                  or Qualifying                       Separate          a House
                                              Widow(er)
50000       8688                     6665                                      8688                 7353
50050       8700                     6673                                      8700                 7365
...
59950       11175                   8158                                      11175                9840
60000       11188                   8165                                      11188                9853


Hint: round the tax into integers using Math.round (i.e., Math .round(computeTax(status, taxableIncome)).

public class ProgrammingExercise6_15 {
 
 public static void main(String[] args) {
  System.out.printf("%-20s%-20s%-20s%-20s%-20s\n", "Taxable", "Single",
    "Married Joint", "Married", "Head of");
  System.out.printf("%-20s%-20s%-20s%-20s%-20s\n", "Income", "",
    "or Qualifying", "Separate", "a House");
  System.out.printf("%-20s%-20s%-20s%-20s%-20s\n", "", "", "Widow(er)",
    "", "");
  System.out.println(String.format("%88s", "").replace(' ', '-'));
  for (int i = 50000; i <= 60000; i += 50) {
   System.out.printf("%-20d%-20d%-20d%-20d%-20d\n", i,
     Math.round(computeTax(0, i)), Math.round(computeTax(1, i)),
     Math.round(computeTax(2, i)), Math.round(computeTax(3, i)));
  }
 
 }
 
 public static double computeTax(int status, double taxableIncome) {
  // Compute tax
  double tax = 0;
 
  if (status == 0) { // Compute tax for single filers
   if (taxableIncome <= 8350)
    tax = taxableIncome * 0.10;
   else if (taxableIncome <= 33950)
    tax = 8350 * 0.10 + (taxableIncome - 8350) * 0.15;
   else if (taxableIncome <= 82250)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15
      + (taxableIncome - 33950) * 0.25;
   else if (taxableIncome <= 171550)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950)
      * 0.25 + (taxableIncome - 82250) * 0.28;
   else if (taxableIncome <= 372950)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950)
      * 0.25 + (171550 - 82250) * 0.28
      + (taxableIncome - 171550) * 0.33;
   else
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950)
      * 0.25 + (171550 - 82250) * 0.28 + (372950 - 171550)
      * 0.33 + (taxableIncome - 372950) * 0.35;
  } else if (status == 1) { // Compute tax for married file jointly
   if (taxableIncome <= 16700)
    tax = taxableIncome * 0.10;
   else if (taxableIncome <= 67900)
    tax = 16700 * 0.10 + (taxableIncome - 16700) * 0.15;
   else if (taxableIncome <= 137050)
    tax = 16700 * 0.10 + (67900 - 16700) * 0.15
      + (taxableIncome - 67900) * 0.25;
   else if (taxableIncome <= 208850)
    tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900)
      * 0.25 + (taxableIncome - 137050) * 0.28;
   else if (taxableIncome <= 372950)
    tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900)
      * 0.25 + (208850 - 137050) * 0.28
      + (taxableIncome - 208850) * 0.33;
   else
    tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900)
      * 0.25 + (208850 - 137050) * 0.28 + (372950 - 208850)
      * 0.33 + (taxableIncome - 372950) * 0.35;
  } else if (status == 2) { // Compute tax for married separately
   if (taxableIncome <= 8350)
    tax = taxableIncome * 0.10;
   else if (taxableIncome <= 33950)
    tax = 8350 * 0.10 + (taxableIncome - 8350) * 0.15;
   else if (taxableIncome <= 68525)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15
      + (taxableIncome - 33950) * 0.25;
   else if (taxableIncome <= 104425)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950)
      * 0.25 + (taxableIncome - 68525) * 0.28;
   else if (taxableIncome <= 186475)
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950)
      * 0.25 + (104425 - 68525) * 0.28
      + (taxableIncome - 104425) * 0.33;
   else
    tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950)
      * 0.25 + (104425 - 68525) * 0.28 + (186475 - 104425)
      * 0.33 + (taxableIncome - 186475) * 0.35;
  } else if (status == 3) { // Compute tax for head of household
   if (taxableIncome <= 11950)
    tax = taxableIncome * 0.10;
   else if (taxableIncome <= 45500)
    tax = 11950 * 0.10 + (taxableIncome - 11950) * 0.15;
   else if (taxableIncome <= 117450)
    tax = 11950 * 0.10 + (45500 - 11950) * 0.15
      + (taxableIncome - 45500) * 0.25;
   else if (taxableIncome <= 190200)
    tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500)
      * 0.25 + (taxableIncome - 117450) * 0.28;
   else if (taxableIncome <= 372950)
    tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500)
      * 0.25 + (190200 - 117450) * 0.28
      + (taxableIncome - 190200) * 0.33;
   else
    tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500)
      * 0.25 + (190200 - 117450) * 0.28 + (372950 - 190200)
      * 0.33 + (taxableIncome - 372950) * 0.35;
  } else {
   System.out.println("Error: invalid status");
   return 0;
  }
 
  return tax;
 
 }
 
}