//	Author: Emily Gibson
//	Class:  CS300 Programming in C++, Fall 2005
//	Section: 02

//	Program: Lab_6_EmilyGibson
//	Version: ANSI/ISO C++
//	Date: December 2, 2005

//The purpose of this program is to provide the user with a means to perform
//conversion operations on units of measure and vice-versa. It also provides 
//the user with a termination option if the user prefers to quit the program. 
//This program will be accomplished using a multi-function program instead of 
//using a strictly int main () format.

#include <iostream>

using namespace std;

//function prototypes
char ConverMenu ();
double Fht2Cls(double);
double Cls2Fht(double);
double Gln2Lts(double);
double Lts2Gln(double);
double Mls2Klm(double);
double Klm2Mls(double);


int main ()
{
	//Declare and initialize variables.
	char operation = ' ';

		

	//Terminate
	return 0;
}//end function main()

//function definitions
char ConverMenu()
{
	//Declare variables and initialize
	char choice = ' ';

	//Display the user menu. The menu will be displayed using a do while statement because
	//by doing so the program menu and results will be guaranteed to display at least once.
	//This menu will use a clear screen operation, display the menu introduction message,
	//and it is designed to loop until a valid response from the user is received by the 
	//program. The while portion of the do while loop tells the program to continue looping
	// when the user input is not equal to a valid menu option.
	do 
	{		
		system ("cls");
		cout << "The purpose of this program is to provide the user with a means\n";
		cout << "to convert various units of measure to their metric counterpart\n";
		cout << "and vice-versa.\n"; 
		cout << "\nPlease select a conversion option from the menu below,\n";
		cout << "or if you prefer, you may choose to Quit the program.\n\n";
		cout << "'0' - Exit the program \n";
		cout << "'1' - Convert degrees Fahrenheit to degrees Celsius\n";
		cout << "'2' - Convert degrees Celsius to degrees Fahrenheit\n";
		cout << "'3' - Convert U.S. gallons to liters\n";
		cout << "'4' - Convert liters to U.S. gallons\n";
		cout << "'5' - Convert statute miles to kilometers\n";
		cout << "'6' - Convert kilometers to statute miles\n";
		cout << "\nPlease enter your conversion menu choice now: ";
		cin  >> choice;
		cin.clear();
	}
	while ((choice != '0') && (choice != '1') && (choice != '2') && (choice != '3')
			&& (choice != '4') && (choice != '5') && (choice != '6'));

	return choice;
}//end function ConverMenu()

//function Fht2Cls.
double Fht2Cls(double Fht)
{
	//Declare and initialize variables.
	double Cls = 0.0;
	Cls = (5/9 * (Fht - 32));
	return Cls;
}//end function Fht_to_Cls

//function Cls_to_Fht.
double Cls2Fht(double Cls)
{
	//Declare and initialize variables.
	double Fht = 0.0;
	Fht = (9/5 * (Cls + 32));
	return Fht;
}//end function Cls_to_Fht

//function Gln2Lts.
double Gln2Lts(double Gln)
{
	//Declare and initialize variables.
	double Lts = 0.0;
	Lts = (Gln * 3.785);
	return Lts;
}//end function Gln2Lts.

//function Lts2Gln.
double Lts2Gln(double Lts)
{
	//Declare and initialize variables
	double Gln = 0.0;
	Gln = (Lts / 3.785);
	return Gln;
}//end function Gln2Lts.

//function Mls2Klm.
double Mls2Klm(double Mls)
{
	//Declare and initialize variables.
	double Klm = 0.0;
	Klm = (Mls * 1.609344);
	return Klm;
}//end function Mls2Klm.

//function Klm2Mls.
double Klm2Mls(double Klm)
{
	//Declare and initialize variables.
	double Mls = 0.0;
	Mls = (Klm / 1.609344);
	return Mls;
}//end function Klm2Mls.