using System;

public class Program

{

    static double Katheteberechnen(double A, double C) 

    {

        double B = Math.Sqrt(C * C - A * A);

        return B;

    }

    static double Hypothenuseberechnen(double A, double B) 

    {

        double C = Math.Sqrt(A * A + B * B);

        return C;

    }

    static double Flächeberechnen(double A, double B) 

    {

        double Area = (A * B) / 2;

        return Area;

    }

    public static void Main()

    {

        while (true) 

        {

            Console.WriteLine("Passwort eingeben: ");

            string input = Console.ReadLine();

            Console.Clear();

            if (input == "arch2022") 

            {

                Console.WriteLine("Passwort korrekt!");

                Console.ReadLine();

                break;

            }

            Console.WriteLine("Falsches Passwort!");

        }

        Console.Clear();

        Console.WriteLine("[0] Kathete berechnen\n[1] Hypothenuse berechnen\n[] Fläche berechnen");

        string MenuInput = Console.ReadLine();

        if (MenuInput == "0") //Kathete berechner

        {

            Console.Clear();

            Console.WriteLine("Kathete A eingeben: ");

            double A = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Hypothenuse C eingeben: ");

            double C = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Kathete B = " + Katheteberechnen(A , C));

        }

        else if (MenuInput == "1") //Hypothenuse berechner

        {

            Console.Clear();

            Console.WriteLine("Kathete A eingeben: ");

            double A = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Kathete B eingeben: ");

            double B = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Hypothenuse C = " + Hypothenuseberechnen(A , B));

        }

        else //Fläche berechner

        {

            Console.Clear();

            Console.WriteLine("Kathete A eingeben: ");

            double A = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Kathete B eingeben: ");

            double B = Convert.ToDouble(Console.ReadLine());

            Console.WriteLine("Fläche = " + Flächeberechnen(A , B));

        }

    }

}