//Determines the retail price of an item according to
//the pricing policies of the Quick-Shop supermarket chain.
#include <iostream>
using namespace std;

const double LOW_MARKUP = 0.05; //5%
const double HIGH_MARKUP = 0.10; //10%
const int THRESHOLD = 7; //Use HIGH_MARKUP if do not
                //expect to sell in 7 days or less.

void introduction( );
//Postcondition: Description of program is written on the screen.

void get_input(double& cost, int& turnover);
//Precondition: User is ready to enters values from the keyboard.
//Postconditions: The value of cost has been set to the
//wholesale cost of one item. The value of turnover has been
//set to the expected number of days until the item is sold.

double price(double cost, int turnover);
//Preconditions: cost is the wholesale cost of one item.
//turnover is the expect number of days until sale of the item.
//Postconditions: Returns the retail price of the item.

void give_output(double cost, int turnover, double price);
//Preconditions: cost is the wholesale cost of one item;
//turnover is the expected time until sale of the item;
//price is the retail price of the item.
//Postconditions: The values of cost, turnover,
//and price have been written to the screen.

int main( )
{
      double wholesale_cost, retail_price;
      int shelf_time;

      introduction( );
      get_input(wholesale_cost, shelf_time);
      retail_price = price(wholesale_cost, shelf_time);
      give_output(wholesale_cost, shelf_time, retail_price);
      return 0;
}

//Uses iostream:
void introduction( )
{
      cout << "This program determines the retail price for\n"
            << "an item at a Quick-Shop supermarket store.\n";
}

//Uses iostream:
void get_input(double& cost, int& turnover)
{
      cout << "Enter the wholesale cost of item $";
      cin >> cost;
      cout << "Enter the expected number of days until sold: ";
      cin >> turnover;
}

//Uses iostream:
void give_output(double cost, int turnover, double price)
{
      cout.setf(ios::fixed|ios::showpoint);
      cout.precision(2);
      cout << "Wholesale cost = $" << cost << endl
            << "Expected time until sold = "
            << turnover << " days" << endl
            << "Retail price= $" << price << endl;
}

//Uses defined constants LOW_MARKUP, HIGH_MARKUP, and //THRESHOLD:
double price(double cost, int turnover)
{
      if (turnover <= THRESHOLD)
            return ( cost + (LOW_MARKUP * cost) );
      else
            return ( cost + (HIGH_MARKUP * cost) );
}