import java.util.Scanner;

public class myProgram {

    static Scanner input = new Scanner(System.in);
    static calculate cObj = new calculate();

    public static void main(String[] args) {

        System.out.println("What do you want to do:\n(1) Calculate KE\n(2) Calculate M\n(3) Calculate V\n");
        int choice = input.nextInt();
        switch (choice) {
        case 1:
            kineticenergy();
            break;
        case 2:
            mass();
            break;
        case 3:
            velocity();
            break;
        default:
            System.out.println("Error");
        break;
        }
        System.out.println("\nType (1) to start again. Type (2) to quit");
        int again = input.nextInt();
        switch (again) {
        case 1:
            System.out.println("\n\n\n\n\n");
            main(args);
            break;
        case 2:
            System.exit(0);
            break;
        default:
            System.out.println("Error");
        break;
        }

    }

    private static void velocity() {

        double kineticenergy, mass;
        System.out.println("Enter mass: (kg)");
        mass = input.nextDouble();
        System.out.println("Enter kinetic energy: (J)");
        kineticenergy = input.nextDouble();
        calculate.calculateV(mass, kineticenergy);
    }

    private static void mass() {

        double kineticenergy, velocity;
        System.out.println("Enter kinetic energy: (J)");
        kineticenergy = input.nextDouble();
        System.out.println("Enter velocity: (m/s)");
        velocity = input.nextDouble();
        calculate.calculateM(kineticenergy, velocity);
    }

    private static void kineticenergy() {

        double mass, velocity;
        System.out.println("Enter mass: (Kg)");
        mass = input.nextDouble();
        System.out.println("Enter velocity: (m/s)");
        velocity = input.nextDouble();
        calculate.calculateKE(mass, velocity);
    }
}