//Converts measurements from standard to metric and vice versa
//Created by Gilad "Speaker For The Dead" Barlev
//Final Programming Edit on 2/11/01 (D/M/Y)
//Final Internal Documentation Edit on 13/11/01 (D/M/Y)

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

int main()
{//beginning of main program

	//intro
	cout << "Speaker For The Dead Presents..." << endl << endl;
	getch();
	
	//declare variables
	int selection = 0.0;
	float input = 0.0;
	float output = 0.0;

//main menu
Main:
	cout << "Standard <> Metric" << endl << "Conversions" << endl;
	getch();
	cout << endl << "Main Menu" << endl << endl << "(1)Length" << endl << "(2)Area" << endl << "(3)Volume" << endl << "(4)Mass" << endl << "(5)Temperature" << endl << "Enter anything else to quit" << endl << "Enter selection=?";
	cin >> selection;

	if (selection == 1)
	{//length

		//length menu
		cout << endl << "Length" << endl << endl << "(1) in -> cm" << endl << "(2) in <- cm" << endl << "(3) f -> m" << endl << "(4) f <- m" << endl << "(5) mi -> km" << endl << "(6) mi <- km" << endl << "(7) BACK" << endl << "Enter selection=?";
		cin >> selection;

		if (selection == 1)
		{//in->cm
			cout << "INCHES TO CENTIMETERS" << endl << endl << "in=?";
			cin >> input;
			output = input / .394;
			cout << "cm=" << output << endl;
			return 0;
		}//end in->cm
		if (selection == 2)
		{//in<-cm
			cout << "CENTIMETERS TO INCHES" << endl << endl << "cm=?";
			cin >> input;
			output = input * .394;
			cout << "in=" << output << endl;
			return 0;
		}//end in<-cm
		if (selection == 3)
		{//ft->m
			cout << "FEET TO METRES" << endl << endl << "ft=?";
			cin >> input;
			output = input / 3.281;
			cout << "m=" << output << endl;
			return 0;
		}//end ft->m
		if (selection == 4)
		{//ft<-m
			cout << "METRES TO FEET" << endl << endl << "m=?";
			cin >> input;
			output = input * 3.281;
			cout << "ft=" << output << endl;
			return 0;
		}//end ft<-m
		if (selection == 5)
		{//km<-mi
			cout << "MILES TO KILOMETERS" << endl << endl << "mi=?";
			cin >> input;
			output = input / .621;
			cout << "km=" << output << endl;
			return 0;
		}//end km<-mi
		if (selection == 6)
		{//km->mi
			cout << "KILOMETERS TO MILES" << endl << endl << "km=?";
			cin >> input;
			output = input * .621;
			cout << "mi=" << output << endl;
			return 0;
		}//end km->mi
		else
		{//quit to main menu
			goto Main;
		}//end of quit
	}//end of length
	
	if (selection == 2)
	{//area

		//area main menu
		cout << "AREA." << endl << endl << "(1) ft² -> m²" << endl << "(2) ft² <- m²" << endl << "(3) mi² -> km²" << endl << "(4) mi² <- km²" << endl << "(5) acres -> hectacres" << endl << "(6) acres <- hectacres" << endl << "(7) BACK" << endl; 
		cin >> selection;
		if (selection == 1)
		{//ft²->m²
			cout << "SQARE FEET TO SQUARE METERS" << endl << endl << "ft²=?";
			cin >> input;
			output = input / 10.76;
			cout << "m²=" << output << endl;
			return 0;
		}//end ft²->m²
		if (selection == 2)
		{//ft²<-m²
			cout << "SQUARE METERS TO SQUARE FEET" << endl << endl << "m²=?";
			cin >> input;
			output = input * 10.76;
			cout << "ft²=" << output << endl;
			return 0;
		}//end ft²<-m²
		if (selection == 3)
		{//mi²->km²
			cout << "SQUARE MILES TO SQUARE KILOMETERS" << endl << endl << "mi²=?";
			cin >> input;
			output = input / .386;
			cout << "km²=" << output << endl;
			return 0;
		}//end mi²->km²
		if (selection == 4)
		{//mi²<-km²
			cout << "SQUARE KILOMETERS TO SQUARE MILES" << endl << endl << "km²=?";
			cin >> input;
			output = input * .386;
			cout << "mi²=" << output << endl;
			return 0;
		}//end km²->mi²
		if (selection == 5)
		{//acres->hectacres
			cout << "ACRES TO HECTACRES" << endl << endl << "acres=?";
			cin >> input;
			output = input / 2.47;
			cout << "hectacres=" << output << endl;
			return 0;
		}//end acres->hectacres
		if (selection == 6)
		{//acres<-hectacres
			cout << "HECTACRES TO ACRES" << endl << endl << "hectacres=?";
			cin >> input;
			output = input * 2.47;
			cout << "acres=" << output << endl;
			return 0;
		}//end acres<-hectacres
		else
		{//quit to main menu
			goto Main;
		}//end of quit
	}//end of area

	if (selection == 3)
	{//volume

		//volume main menu
		cout << endl << "Volume" << endl << endl << "(1) fl oz -> mL" << endl << "(2) fl oz <- mL" << endl << "(3) gal -> L" << endl << "(4) gal <- L" << endl << "(5) BACK" << endl;
		cin >> selection;
		
		if (selection == 1)
		{//fl oz->mL
			cout << "FLUID OUNCES TO MILILITERS" << endl << endl << "fl oz=?";
			cin >> input;
			output = input / .034;
			cout << "mL=" << output << endl;
			return 0;
		}//end fl oz->mL
		if (selection == 2)
		{//fl oz<-mL
			cout << "MILILITERS TO FLUID OUNCES" << endl << endl << "mL=?";
			cin >> input;
			output = input * 3.281;
			cout << "fl oz=" << output << endl;
			return 0;
		}//end fl oz<-mL
		if (selection == 3)
		{//gal->L
			cout << "GALLONS TO LITERS" << endl << endl << "gal=?";
			cin >> input;
			output = input / .264;
			cout << "L=" << output << endl;
			return 0;
		}//end gal->L
		if (selection == 4)
		{//gal<-L
			cout << "LITERS TO GALLONS" << endl << endl << "L=?";
			cin >> input;
			output = input * .264;
			cout << "gal=" << output << endl;
			return 0;
		}//gal<-L
		else
		{//quit to main menu
			goto Main;
		}//end of quit
	}//end ofvolume

	if (selection == 4)
	{//mass
		
		//mass main menu
		cout << endl << "Mass" << endl << endl << "(1) oz -> g" << endl << "(2) oz <- g" << endl << "(3) lbs -> kg" << endl << "(4) lbs <- kg" << endl << "(5) T -> t" << endl << "(6) T <- t" << endl << "(7) BACK" << endl;
		cin >> selection;
		if (selection == 1)
		{//oz->g
			cout << "OUNCES TO GRAMS" << endl << endl << "oz=?";
			cin >> input;
			output = input / .035;
			cout << "g=" << output << endl;
			return 0;
		}//end oz->g
		if (selection == 2)
		{//oz<-g
			cout << "GRAMS TO OUNCES" << endl << endl << "g=?";
			cin >> input;
			output = input * .035;
			cout << "oz=" << output << endl;
			return 0;
		}//end oz<-g
		if (selection == 3)
		{//lbs->kg
			cout << "POUNDS TO KILOGRAMS" << endl << endl << "lbs=?";
			cin >> input;
			output = input / 2.205;
			cout << "kg=" << output << endl;
			return 0;
		}//end lbs->kg
		if (selection == 4)
		{//lbs<-kg
			cout << "KILOGRAMS TO POUNDS" << endl << endl << "kg=?";
			cin >> input;
			output = input * 2.205;
			cout << "lbs=" << output << endl;
			return 0;
		}//end lbs<-kg
		if (selection == 5)
		{//T->t
			cout << "TONS TO METRIC TONS" << endl << endl << "T=?";
			cin >> input;
			output = input / 1.102;
			cout << "t=" << output << endl;
			return 0;
		}//end T->t
		if (selection == 6)
		{//T<-t
			cout << "METRIC TONS TO TONS" << endl << endl << "t=?";
			cin >> input;
			output = input * 1.102;
			cout << "T=" << output << endl;
			return 0;
		}//end T<-t
		else
		{//quit to main menu
			goto Main;
		}//end of quit
	}//end of mass

	if (selection == 5)
	{//temperature
		cout << endl << "Temperature" << endl << endl << "(1) °F -> °C" << endl << "(2) °F <- °C" << endl << "(3) °F -> °K" << endl << "(4) °F <- °K" << endl << "(5) °C -> °K" << endl << "(6) °C <- °K" << endl << "(7) BACK" << endl;
		cin >> selection;
		if (selection == 1)
		{//°F->°C
			cout << "DEGREES FARENHEIT TO DEGREES CELSIUS" << endl << endl << "°F=?";
			cin >> input;
			output = (input - 32) * 5/9;
			cout << "°C=" << output << endl;
			return 0;
		}//end °F->°C
		if (selection == 2)
		{//°F<-°C
			cout << "DEGREES CELSIUS TO DEGREES FARENHEIT" << endl << endl << "°C=?";
			cin >> input;
			output = input * (9/5) + 32;
			cout << "°F=" << output << endl;
			return 0;
		}//end °F<-°C
		if (selection == 3)
		{//°F->°K
			cout << "DEGREES FARENHEIT TO DEGREES KELVIN" << endl << endl << "°F=?";
			cin >> input;
			output = (input - 32) * 5/9 + 273.15;
			cout << "°K=" << output << endl;
			return 0;
		}//end °F->°K
		if (selection == 4)
		{//°F<-°K
			cout << "DEGREES KELVIN TO DEGREES FARENHEIT" << endl << endl << "°K=?";
			cin >> input;
			output = input * (9/5) - 241.15;
			cout << "°F=" << output << endl;
			return 0;
		}//end °F<-°K
		if (selection == 5)
		{//°C->°K
			cout << "DEGREES CELSIUS TO DEGREES KELVIN" << endl << endl << "°C=?";
			cin >> input;
			output = input + 273.15;
			cout << "°K=" << output << endl;
			return 0;
		}//end °C->°K
		if (selection == 6)
		{//°C<-°K
			cout << "DEGREES KELVIN TO DEGREES CELSIUS" << endl << endl << "°K=?";
			cin >> input;
			output = input - 273.15;
			cout << "°C=" << output << endl;
			return 0;
		}//end °C<-°K
		else
		{//quit to main menu
			goto Main;
		}//end of quit
	}//end of temperature

	//credits and return function
	cout << "This program was made by Speaker For The Dead for entertainment purposes only."  << endl << "For problems with this program or more information on Speaker For The Dead," << endl<< "Please send an email to the_sftd@yahoo.com" << endl;
	return 0;
}//end of program

//This program was made by Speaker For The Dead for entertainment purposes only.
//For problems with this program or more information on Speaker For The Dead,
//Please send an email to the_sftd@yahoo.com