using System;

public class Program

{

    static private double hyp(double a, double b)

    {

        double a2 = a*a;

        double b2 = b*b;

        return Math.Sqrt(a2 + b2);

    }

    static private double pyth(double a, double c)

    {

        double a2 = a*a;

        double c2 = c*c;

        return Math.Sqrt(c2-a2);

    }

    public static void Main()

    {

        string restart = "This variable will let me quit the program";

            while (restart != "q")

            {

        start:

        Console.WriteLine("Enter 1 if you are missing the hypotenuse and 2 if you are missing a leg");

        byte input = byte.Parse(Console.ReadLine());

        if (input == 1)

        {

            Console.WriteLine("enter the length of leg 1");

            double leg1 = double.Parse(Console.ReadLine());

            Console.WriteLine("enter the lenth of leg 2");

            double leg2 = double.Parse(Console.ReadLine());

            Console.WriteLine("The hypotenuse is: " + hyp(leg1, leg2).ToString("##.##"));

        }

        else if (input == 2)

        {

            Console.WriteLine("enter the length of your leg");

            double leg = double.Parse(Console.ReadLine());

            Console.WriteLine("enter the length of your hypotenuse");

            double hyp = double.Parse(Console.ReadLine());

            Console.WriteLine("The length of your missing leg is: " + pyth(leg,hyp).ToString("##.##"));

        }

        else

        {

            Console.WriteLine("You must enter 1 or 2");

            goto start;

        }

        Console.WriteLine("Press q to quit or press any other key to continue");

        restart = Console.ReadLine();

            }

    }

}