using System;

public class Program

{   

    //optional arguments always after required

    static int Power(int x, int y = 2)

    {

        int result = 1;

        for (int i = 0; i<y; i++)

        {

            result *= x;

        }

        return result;

    }

    //named arguments - to not remember the order

    static double TriangleArea(int t_height, int t_base)

    {

        return t_height * t_base * 0.5;

    }

    public static void Main()

    {

        Console.WriteLine(Power(3));

        Console.WriteLine(Power(3,3));

        Console.WriteLine(Power(3,0));

        Console.WriteLine(Power(12));

        double Area = TriangleArea(t_base: 5, t_height: 7);

        Console.WriteLine(Area);

    }

}