Exercise_4/Task_2_3

import java.text.DecimalFormat;
import java.util.Scanner;

public class Task_2_3 {

    public static void main(String[] args) {

        DecimalFormat df = new DecimalFormat("0.#####");
        Scanner input = new Scanner(System.in);
        Task_2_3 myApp = new Task_2_3();

        boolean exit = false;
        System.out.println("--- Welcome to the conversion center ---");
        do {
            System.out.printf("%n1) Kilograms to pounds%n2) Pounds to kilograms%n3) Meters to feet%n4) Feet to meters%n5) Exit%n%n");
            System.out.println("Please enter your choice");
            int choice = input.nextInt();
            if (choice == 1) {
                System.out.println("Please enter your number in Kilograms");
                double K = input.nextInt();
                double res = myApp.KtoP(K);
                System.out.printf("Your converted number is: ");
                System.out.print(df.format(res));
                System.out.printf(" Pounds");
                try {
                    Thread.sleep(2500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            } else if (choice == 2) {
                System.out.println("Please enter your number in Pounds");
                double P = input.nextDouble();
                double res = myApp.PtoK(P);
                System.out.printf("Your converted number is: ");
                System.out.print(df.format(res));
                System.out.printf(" Kilograms");
                try {
                    Thread.sleep(2500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            } else if (choice == 3) {
                System.out.println("Please enter your number in Meters");
                double M = input.nextDouble();
                double res = myApp.MtoF(M);
                System.out.printf("Your converted number is: ");
                System.out.print(df.format(res));
                System.out.printf(" Feet");
                try {
                    Thread.sleep(2500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            } else if (choice == 4) {
                System.out.println("Please enter your number in Feet");
                double F = input.nextDouble();
                double res = myApp.FtoM(F);
                System.out.printf("Your converted number is: ");
                System.out.print(df.format(res));
                System.out.printf(" Meters");
                try {
                    Thread.sleep(2500);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            } else if (choice == 5) {
                exit = true;
                System.out.println("Goodbye!");
            } else {
                System.out.println("Error! Wrong input! Please enter a correct option");
            }


        } while (!exit);

    }

    private double MtoF(double a) {
        return a * 3.28084;
    }

    private double FtoM(double a) {
        return a * 0.3048;
    }

    private double KtoP(double a) {
        return a * 2.20462;
    }

    private double PtoK(double a) {
        return a * 0.453592;
    }

}