import java.util.*;

public class Conversion {	

	// conversion equivalencies	
	private static final double
		KILOMETERS_PER_MILE = 1.609344;	
	private static final double
		LITERS_PER_GALLON = 3.785411784;	
	private static final double
		GRAMS_PER_OUNCE = 28.349523125;	
	private static final double
		HECTARES_PER_ACRE = 0.40468564;

	// temperature conversions methods	
	public static double fahrenheitToCelsius(double f) {	
		return (f - 32) / 1.8;	
	}	
	
	public static double celsiusToFahrenheit(double c) {	
		return 1.8 * c + 32;	
	}	
	
	// length conversions methods	
	public static double kilometersToMiles(double km) {	
		return km / KILOMETERS_PER_MILE;	
	}

	// mass conversions methods	
	public static double litersToGallons(double liters) {	
		return liters / LITERS_PER_GALLON;	
	}	
	
	public static double gallonsToLiters(double gallons) {	
		return gallons * LITERS_PER_GALLON;	
	}	
	
	public static double gramsToOunces(double grams) {	
		return grams / GRAMS_PER_OUNCE;	
	}	
	
	public static double ouncesToGrams(double ounces) {	
		return ounces * GRAMS_PER_OUNCE;	
	}

	// area conversions methods	
	public static double hectaresToAcres(double hectares) {	
		return hectares / HECTARES_PER_ACRE;	
	}	
	
	public static double acresToHectares(double acres) {	
		return acres * HECTARES_PER_ACRE;	
	}	


	public static void main(String[] args) {
		Scanner stdin = new Scanner (System.in);

		System.out.print("Enter a length in kilometers: ");
		double kilometers = stdin.nextDouble();
		double miles = Conversion.kilometersToMiles(kilometers);
		
		System.out.print("Enter a mass in liters: ");
		double liters = stdin.nextDouble();
		double gallons = Conversion.litersToGallons(liters);
		
		System.out.print("Enter a mass in grams: ");
		double grams = stdin.nextDouble();
		double ounces = Conversion.gramsToOunces(grams);
		
		System.out.print("Enter an area in hectares: ");
		double hectares = stdin.nextDouble();
		double acres = Conversion.hectaresToAcres(hectares);

		System.out.println(kilometers + " kilometers = "	
				+ miles + " miles ");	
		System.out.println(liters + " liters = "	
				+ gallons + " gallons");	
		System.out.println(grams + " grams = "	
				+ ounces + " ounces");	
		System.out.println(hectares + " hectares = " 	
				+ acres + " acres");

	}
}