#include <iostream.h>
#include <iomanip.h>
#include <limits.h> // for INT_MAX


double compute_tax (double taxable_income) {

  if (taxable_income <= 10000) {
    // pay just 17% on everything
    return 0.17 * taxable_income;
  }

  if (taxable_income <= 25000) {
    // pay 17% on the first 10000 and 22% on thge balance
    return (0.17 * 10000) + (0.22 * (taxable_income - 10000));
  }

  // a high roller
  return (0.17 * 10000) + (0.22 * 15000) + (0.30 * (taxable_income - 25000));

}


double compute_taxable_income (double earned_income, int age, int dependents) {

  double taxable_income;

  taxable_income = earned_income - 5000;

  if (age >= 65) {
    taxable_income -= 2000;
  }

  taxable_income -= dependents * 1000;

  if (taxable_income < 0) {
    taxable_income = 0;
  }

  return taxable_income;

}


void calculate_and_output_tax (double earned_income, int age, int dependents) {

  double taxable_income, tax;

  taxable_income = compute_taxable_income (earned_income, age, dependents);
  tax = compute_tax (taxable_income);

  cout << setprecision(2) << setiosflags(ios::fixed | ios::showpoint)
       << "Taxable income: $" << taxable_income << " Tax: $" << tax << endl;

}


int main () {

  double earned_income;
  int age, dependents;

  for (;;) {

    cout << endl << "Please enter earned income, age, and dependents"
         << endl << "(all zeroes to stop): ";
    cin >> earned_income >> age >> dependents;

    if (cin.fail()) {

      // the input operation failed altogether (the user did not enter
      // a valid double value followed by two int values).

      // begin by outputting an error message.
      cout << "Garbage input ignored." << endl;
      // now reset cin and discard the balance of the current input line
      // (clear the deck so that we can try again).
      cin.clear ();
      cin.ignore (INT_MAX, '\n');

    } else if ((earned_income == 0) && (age == 0) && (dependents == 0)) {

      return 0; // we're all done - go home

    } else if ((earned_income < 0) || (dependents < 0) || (age < 0)) {

      // the input values are unreasonable
      cout << "Unreasonable values ignored." << endl;

    } else {

      calculate_and_output_tax (earned_income, age, dependents);

    }

  } // end for (;;)

} // end main