using System;

​

public class Program

{

    static private double pyth(double a, double b)

    {

        double a2 = a * a;

        double b2 = b * b;

        return Math.Sqrt(a2 + b2);

    }

​

    public static void Main()

    {

        start:

            Console.WriteLine("Type 1 if you want to find the leg, Type 2 if you want to find the hypotenuse");

        string answer = Console.ReadLine();

        if (answer == "1")

        {

            Console.Clear();

            Console.WriteLine("Please enter your first value");

        double input1 = double.Parse(Console.ReadLine());

        Console.WriteLine("Please enter your second value");

        double input2 = double.Parse(Console.ReadLine());

        double output = pyth(input1, input2);

        Console.WriteLine(output);

        goto start;

        }

        else if (answer == "2")

        {

            Console.Clear();

            Console.WriteLine("Please enter your first value");

        double input3 = double.Parse(Console.ReadLine());

        Console.WriteLine("Please enter your second value");

        double input4 = double.Parse(Console.ReadLine());

        double output1 = pyth(input3, input4);

        Console.WriteLine(output1);

        goto start;

        }

    }

}