#include <iostream>
#include <math.h>
using namespace std;

void GiveChanges (double change)
{  
	int dollar, cents, quarters, dimes, nickles;

	cout.unsetf (ios::floatfield);                // floatfield not set
	cout.setf (ios::fixed); //, std:: ios::floatfield);
	cout.precision(20);
 	cout <<"Changes to give:"<<change<<endl;

	dollar = floor(change);
	cents =   (change-dollar) *100;
	cout <<"cent is " << cents<<endl;
	//cents = round(  (change-dollar) *100.0);
	quarters = cents /25;
	cents -= quarters*25;
	dimes = cents /10;
	cents -= dimes * 10;
	nickles = cents /5;
	cents -= nickles*5;

	cout <<"("<<dollar<<" dollars,"
       	     << quarters <<" quarters," << dimes <<" dimes," << nickles <<" nickles,"
	     << cents <<" pennies)" <<endl;
}

int main()
{
	//define symbolic constant for the prices of different orders on sale
	const double PRICE_MEDIA_PIZZA=12.39;
	const double PRICE_LARGE_PIZZA=15.98;
	const double PRICE_SMALL_DRINK=1.0;
	const double PRICE_MEDIUM_DRINK=1.45;
	const double PRICE_LARGE_DRINK=1.45;

	// declare variables: in addition to those used in lab2, you will need some new variables
	double amountDue = 0.0, amountReceived;
	char selectionCode;
	int selectAmt;
	
	// Display greeting message, and the menu
	cout <<"Welcome to Little Italy Pizza!";
	cout <<"Today's menu, use the letter in parenthesis to select:\n";
	cout <<"Medium pizza ($" << PRICE_MEDIA_PIZZA << ") (M)\n";
	cout <<"Large pizza ($" << PRICE_LARGE_PIZZA << ") (L)\n";
	cout <<"Small soft drink ($" << PRICE_SMALL_DRINK <<") (S)\n";
	cout <<"Medimum soft drink ($" <<PRICE_MEDIUM_DRINK <<") (D)\n";
	cout <<"Large soft drink ($" << PRICE_LARGE_DRINK <<") (T)\n";

	
	
	//Accepting order
	do {
		// prompt the cashier to enter the next item
		cout <<"Enter the order (e.g., T2 for two large soft drink, Q1 to finish): ";
		// read from standard input: SelectionCode and selectionAmnt
		cin >> selectionCode >> selectAmt;

		//update the total amount due
		if (selectionCode!='Q'){
			switch (selectionCode)
			{
				case 'M':
					amountDue += selectAmt * PRICE_MEDIA_PIZZA;
					break;
				case 'L':
					amountDue += selectAmt * PRICE_LARGE_PIZZA;
					break;
				case 'S':
					amountDue += selectAmt * PRICE_SMALL_DRINK;
					break;
				case 'D':
					amountDue += selectAmt * PRICE_MEDIUM_DRINK;
					break;
				case 'T':
					amountDue += selectAmt * PRICE_LARGE_DRINK;
					break;
				default:
					cout <<"Invalid selection code: " 
						<<selectionCode<<endl;
					break;
			}
		}
	} while (selectionCode != 'Q') ;
	
	cout <<"Total amount due: " << amountDue<<endl;
	cout <<"Enter the amount received: ";
	cin >> amountReceived;
	
	// call GiveChanges( ) to display the changes, for example, suppose variable 

	GiveChanges (amountReceived-amountDue);
}