/*
 *          File: tax.cpp
 *        Author: Robert I. Pitts <rip@cs.bu.edu>
 * Last Modified: October 13, 1999
 *         Topic: Determining Tax from a Table - Lab
 * ----------------------------------------------------------------
 *
 * This program determines the tax for a given income and filing status.
 *
 * The user may enter several income amounts (i.e., from different income
 * sources).  The user must also enter their filing status.  The program
 * sums up the income amounts to determine the total income and looks up
 * and prints out the tax for that income and filing status.
 */


#include <iostream.h>


/***************************** Constants *****************************/

// Maximum # of income amounts this program can handle.  This includes the
// 0 (zero) income used to mark the end of incomes.

#define MAX_INCOMES  10

// Number of rows in the tax table.

#define NUM_ROWS  10

// Each row in tax table corresponds to $5000 of income, e.g., $0-$4999,
// $5000-$9999, etc.

#define EACH_ROW  5000

// Number of filing statuses (columns in tax table).

#define NUM_STATUSES  4

// Labels for filing statuses.

char *status_label[NUM_STATUSES] = {
  "Single",
  "Married Filing Jointly",
  "Married Filing Separately",
  "Head of Household"
};

/************************ Function Prototypes ************************/

/*
 * Function: ReadIncome
 * Usage: ReadIncome(income_list);
 *
 * Reads income amounts into the array passed to it until an amount of 0
 * (zero) is entered.  The zero is stored in the array to mark the end of
 * incomes.  It cannot read in more than MAX_INCOMES amounts (including the
 * zero), since that is the maximum size of the array passed to it.
 */
void ReadIncome(int income_list[MAX_INCOMES]);

/*
 * Function: SumIncome
 * Usage: SumIncome(income_list);
 *
 * Sums all the income amounts in the passed array.  It knows there are no
 * more incomes when the value 0 (zero) is reached.
 */
int SumIncome(int income_list[MAX_INCOMES]);

/*
 * Function: GetTax
 * Usage: tax = GetTax(tax_table, income, filing_status);
 *
 * Takes the tax table and returns the tax owed for the specified income
 * and filing status.
 */
int GetTax(int tax_table[NUM_ROWS][NUM_STATUSES],
           int income,
           int filing_status);


/*************************** Main Program **************************/

int main()
{
  int income_list[MAX_INCOMES];  // Income amounts from different sources
  int status;                    // Filing status
  int income;                    // Total income

  int tax_table[NUM_ROWS][NUM_STATUSES] = {
    { 600,  500,  600,  550 },
    { 1200, 1000, 1200, 1100 },
    { 1800, 1500, 1800, 1650 },
    { 2400, 2000, 2400, 2200 },
    { 3000, 2500, 3000, 2750 },
    { 3600, 3000, 3600, 3300 },
    { 4900, 5950, 5250, 5600 },
    { 5600, 6800, 6000, 6400 },
    { 6300, 7650, 6750, 7200 },
    { 7000, 8500, 7500, 8000 }
  };

  cout << "Welcome to the tax calculator.\n"
       << "Enter income amounts from each of your income sources rounded\n"
       << "to the nearest dollar.  Enter 0 (zero) when you are done." << endl;

  ReadIncome(income_list);

  cout << "\nFiling Statuses:" << endl;

  for (int i = 0; i < NUM_STATUSES; i++) {
    cout << "\t" << i << " = " << status_label[i] << endl;
  }

  cout << "\nEnter status: ";
  cin >> status;

  income = SumIncome(income_list);

  cout << "\nYou owe $" << GetTax(tax_table, income, status)
       << " on your income of $" << income << endl;

  return 0;
}


/*********************** Function Definitions **********************/

void ReadIncome(int income_list[MAX_INCOMES])
{
  //FILL IN!
}

int SumIncome(int income_list[MAX_INCOMES])
{
  //FILL IN!
}

int GetTax(int tax_table[NUM_ROWS][NUM_STATUSES],
           int income,
           int filing_status)
{
  return tax_table[ /* row index */ ][filing_status];
}