/*
 *   The code written in this class was created by Jacob Cuomo
*/


import java.util.Scanner;

public class Conversion {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int num = 0;
        boolean isNum = false;

        System.out.println("Enter a distance in meters: ");
        // This loop checks to determine if the number entered is positive and is actually
        // a number.
        do {
            System.out.println("The number you enter should be positive");
            while (!input.hasNextInt()) {
                System.out.println("Please enter a valid number");
                input.next();
            }
            num = input.nextInt();
        } while (num <= 0);

        // The following loop will make sure the menu continually appears.
        int option = 0;
        while (option != 4) {
            displayMenu();
            do {
                System.out.println("Enter a number 1-4");
                while (!input.hasNextInt()) {
                    System.out.println("Please enter a valid number");
                    input.next();
                }
                option = input.nextInt();
            } while(!(option >= 1 && option <= 4));
            switch(option) {
                case 1:
                    showKilometers(num); break;
                case 2:
                    showInches(num); break;
                case 3:
                    showFeet(num); break;
                case 4:
                    System.exit(0);
                default:
                    System.out.println("Unsure how you got here.");
            }
        }
    }

    private static void displayMenu() {
        System.out.println("Choose an option from the menu as you like.");
        System.out.println("1. Convert to Kilometers");
        System.out.println("2. Convert to Inches");
        System.out.println("3. Convert to Feet");
        System.out.println("4. Exit Program");
    }

    private static void showKilometers(int meters) {
        double kilometers = meters * 0.001;
        System.out.println(meters + " meters is " + kilometers + " kilometers.");
    }

    private static void showInches(int meters) {
        double inches = meters * 39.37;
        System.out.println(meters + " meters is " + inches + " inches.");
    }

    private static void showFeet(int meters) {
        double feet = meters * 3.281;
        System.out.println(meters + " meters is " + feet + " feet.");
    }
}