#include <iostream>
#include <string> //Needed for string variables
#include <windows.h> //To have Colors
#include <cmath> //Needed for ceil() & floor()
#include <iomanip> //Needed for setw() 

using namespace std;

void welcome();
//A message to greet user

void hitEnter();
//Prompt user to hit ENTER key in order to continue

void logo();
//My logo JB will display to id my work

string getUserName();
//Prompt user for name and return the name

void order();



void echoInfo( string userName );



void obtainSizeAndPrice( string userName, int& size, int& price );



void echoInfo( string userName, int size, int price );



double getAreaOfPizza( double P_I, int size );



double calculatePizzaPrice( double areaOfPizza, int price );



double round( double pizzaCost );

void niceFormat();




int main()
{
	//User defined function calls

	welcome();
	logo();
	order();
	

	return(0);

}

/**********************************************************
***********************************************************

				 FUNCTION DECLARATIONS
					
***********************************************************
**********************************************************/







/**********************************************************
***********************************************************

  hitEnter prompt user to hit enter in order to continue 
					
***********************************************************
**********************************************************/

void hitEnter()
{

	cout << "\n\n\t\t\t*** Hit ENTER to continue ****\n";
	cin.ignore();

	return;
}



/**********************************************************
***********************************************************

				 Order 
					
***********************************************************
**********************************************************/

void order()
{

	const double P_I = 3.14159;
	
	string userName;
	
	int size,
        price;
		
	double areaOfPizza,
		   pizzaCost,
		   roundFloor,
		   roundPizza;
		 
		   

	userName = getUserName();
    echoInfo ( userName );
	
	obtainSizeAndPrice( userName, size, price );
	echoInfo( userName, size, price );
	
	cout << "\n\n\nSince a " <<size << "-inch pizza covers ";
	areaOfPizza = getAreaOfPizza( P_I, size );
	cout << areaOfPizza <<
	cout << " square inches, then at " << price<< " cents per square\n";
	cout << "inch, the cost is $"; 
	

	niceFormat();
	
	
	pizzaCost = calculatePizzaPrice( areaOfPizza, price );
	cout << pizzaCost<<
	cout << ". This rounds to $";

	roundPizza = round( pizzaCost );
	cout << roundPizza<<
	cout <<"\n\n";
	
	
	
	cin.ignore();
}

/**********************************************************
***********************************************************

       GetUserName ask for username and stores it

***********************************************************
**********************************************************/
string getUserName()
{
	
	string name;

	cout << "\n\nPlease enter your first name and hit ENTER: ";
	cin >> name;
	return name;
}

/**********************************************************
***********************************************************

           echoInfo returns the name of user.

***********************************************************
**********************************************************/
void echoInfo( string userName )
{
	cout << "\n\n\t Ah, " <<userName << ", so nice to have you joining us";
	cout << " today for some pizza!!\n\n\n";
    
	hitEnter();
	cin.ignore();
    system( "cls" );

    return;
}

/**********************************************************
***********************************************************

     obtainSizeAndPrice ask user for size and price 

**********************************************************
**********************************************************/
void obtainSizeAndPrice( string userName, int& size, int& price )
{
	cout <<"\n\n\n  "<<userName << ", please enter the pizza size (5 - 25 inches in diameter),";
	cout << " and price \n";   
	cout << "of ingredients (10 - 15 cents per square inch of pizza), like 5 10:  ";
	cin  >> size >> price;
    
	return;
}

/**********************************************************
***********************************************************

          echoInfo display info given by user 

***********************************************************
**********************************************************/
void echoInfo( string userName, int size, int price )
{
	cout << "\n\n\nThanks, " <<userName << ", for selecting a " <<size << "-inch pizza at ";
	cout <<price << " cents per square inch.\n";

	hitEnter();
	cin.ignore();
    system( "cls" );
	
	return;
}


void niceFormat()
{

	cout.setf(ios::fixed);

	cout.setf(ios::showpoint);

	return;

}
double getAreaOfPizza( double P_I, int size )
{
	return (P_I*(size/2)*(size/2));
}

double calculatePizzaPrice( double areaOfPizza, int price )
{
	return ((areaOfPizza*price)/100);
}

double round( double pizzaCost )
{
	return (floor(pizzaCost + 0.5));
}