Задача за освобождаване

////////////////////////////////////////////////////////////////////////////////
//        NAME: main.cpp
// DESCRIPTION: A program that helps a printer in making quotes for
//              their products.
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-11
// MODIFY/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <iomanip>

using namespace std;

////////////////////////////////////////////////////////////////////////////////
//        NAME: round
// DESCRIPTION: Rounds down or up, respectively to the number,
//              to the nearest multiple of the number.
//   ARGUMENTS: numer, multiple
// USES GLOBAL: none
// MODIFIES GL: none
//     RETURNS: int
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-11
// MODIFY/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
#define roundNumber(number, multiple) ( number % multiple < 8 ? (number >= 0 ? (number / multiple) * multiple : ((number - multiple + 1) / multiple) * multiple) : (number >= 0 ? ((number + multiple - 1) / multiple) * multiple : (number / multiple) * multiple))

////////////////////////////////////////////////////////////////////////////////
//        NAME: calculate_the_job
// DESCRIPTION: Calculates the price of a job given the number of pages,
//              price per sheet, price per plate, and number of copies.
//   ARGUMENTS: number_of_pages, number_of_copies, price_per_sheet,
//              price_per_plate
// USES GLOBAL: none
// MODIFIES GL: none
//     RETURNS: double number
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
double calculate_the_job(int number_of_pages, int number_of_copies, int print_car_pages, double price_per_sheet, double price_per_plate) {
  number_of_pages = roundNumber(number_of_pages, print_car_pages);
  return (((number_of_pages * price_per_plate) + (((number_of_pages / 2) * number_of_copies) * price_per_sheet) + (number_of_copies * 2.00)) + (((number_of_pages * price_per_plate) + (((number_of_pages / 2) * number_of_copies) * price_per_sheet) + (number_of_copies * 2.00)) * (17.5 / 100)));
}

////////////////////////////////////////////////////////////////////////////////
//        NAME: calculate_bw_printing
// DESCRIPTION: Calculates the price of a job given the number of pages and
//              the number of copies for black and white printing.
//   ARGUMENTS: number_of_pages, number_of_copies
// USES GLOBAL: none
// MODIFIES GL: none
//     RETURNS: double number
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
double calculate_bw_printing(int number_of_pages, int number_of_copies, int print_car_pages) {
  return calculate_the_job(number_of_pages, number_of_copies, print_car_pages, 0.01, 7);
}

////////////////////////////////////////////////////////////////////////////////
//        NAME: calculate_color_printing
// DESCRIPTION: Calculates the price of a job given the number of pages and
//              the number of copies for color printing.
//   ARGUMENTS: number_of_pages, number_of_copies
// USES GLOBAL: none
// MODIFIES GL: none
//     RETURNS: double number
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
double calculate_color_printing(int number_of_pages, int number_of_copies,int print_car_pages) {
  return calculate_the_job(number_of_pages, number_of_copies, print_car_pages, 0.04, 28);
}

////////////////////////////////////////////////////////////////////////////////
//        NAME: main
// DESCRIPTION: The main fragment of the program. Outputs information
//              about the functions that are described above.It has
//              been used manipulators to output two numbers after
//              the decimal part of the number.
//              Manipulators Used: setprecision and fixed
//   ARGUMENTS: none
// USES GLOBAL: none
// MODIFIES GL: none
//     RETURNS: int(0)
//      AUTHOR: Stf Kolew
// AUTHOR/DATE: JP 2017-10-12
////////////////////////////////////////////////////////////////////////////////
int main() {

  // 1 Print Car
  cout << fixed << setprecision(2) << calculate_the_job(16, 1, 1, 0.01, 7) << endl;

  // 50 copies of books with 30 pages each, rounded down to 16 pages
  // due to 1 print car = 16 pages.
  cout << calculate_color_printing(30, 50, 16) << endl;

  // 35 copies of books with 34 pages each. Uses 2 print cars
  // Due to 34's lowest multiple of 16 is 32.
  cout << calculate_bw_printing(34, 35, 16) << endl;

  // 35 copies of books with 34 pages each where print car
  // pages equals 8.
  cout << calculate_bw_printing(34, 35, 8) << endl;
  // 100 copies of books with 34 pages each where print car
  // pages equals 6.
  cout << calculate_bw_printing(34, 100, 6) << endl;

  return 0;
}