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

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

//Uses iostream.h:
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.h:
void give_output(double cost, int turnover, double price)
{
    cout.setf(ios::fixed);
    cout.setf(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) );
}