// Ch. 10 Demo #6
// Wyo C++
// October 24, 2001
// Purpose - processes Amazon.com customers using struct variables and a function

// Note that the struct definitions as well as the computeTax function could be placed
//		in another file such as amazon.h and the program would still work if you then
//		add the compiler directive		#include "amazon.h"		

#include <iostream.h>

double computeTax(double myPrice);		// compute's PA sales tax

struct Basket
{
	int books;				// number of books purchased by customer
	int cds;				// number of cd's purchased by customer
	int toys;				// number of toys purchased by customer
	double totalPrice;			// customer's total amount due
	char coupon;				// customer's coupon rate
};

struct Prices
{
	double book;				// price of one book
	double cd;				// price of one cd
	double toy;				// price of one toy
	double couponA;				// discount rate for coupon A
	double couponB;				// disount rate for coupon B
};

int main()
{
	Basket currentCustomer;			// basket of Amazon.com customer who is browsing
	Basket checkoutCustomer;		// basket of Amazon.com customer who is checking out
	Prices october;				// October price schedule

	october.book = 1;			// setting october price schedule
	october.cd = 10.99;
	october.toy = 15;
	october.couponA = 0.1;
	october.couponB = 0.5;

	cout << "How many books: ";		// current customer is browsing the site
	cin >> currentCustomer.books;

	cout << "How many cds: ";
	cin >> currentCustomer.cds;

	cout << "How many toys: ";
	cin >> currentCustomer.toys;
						// computing current customer's total amount due
	currentCustomer.totalPrice = october.book * currentCustomer.books +
		october.cd * currentCustomer.cds + october.toy * currentCustomer.toys;

	cout << "Your price is " << currentCustomer.totalPrice << endl << endl;

	checkoutCustomer.books = 1;		// assume that the checkout customer has already made
	checkoutCustomer.cds = 6;		//		these purchases
	checkoutCustomer.toys = 2;
	checkoutCustomer.coupon = 'A';
	checkoutCustomer.totalPrice = 
		checkoutCustomer.books * october.book
		+ checkoutCustomer.cds * october.cd
		+ checkoutCustomer.toys * october.toy;

	if (checkoutCustomer.coupon == 'A')
	{
		checkoutCustomer.totalPrice -=  checkoutCustomer.totalPrice * october.couponA;
	}
	else if (checkoutCustomer.coupon == 'B')
	{
		checkoutCustomer.totalPrice -= checkoutCustomer.totalPrice * october.couponB;
	}
	// otherwise no coupon was used

	cout << "The checkoutCustomer's total amount due is: " <<
		computeTax(checkoutCustomer.totalPrice) << endl << endl;

	return 0;
}// end of main

double computeTax(double myPrice)
{
	return (myPrice * 1.06);
}// end of computeTax