using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Running:");

        PrintInput();

        PrintInput(value: null);

        Console.WriteLine("Running second");

        PrintInputSecond();

        PrintInputSecond(value: null);

    }

    public static void PrintInput(int? value = 65)

    {

        if (value is null)

        {

            Console.WriteLine("Empty.");

            return;

        }

​

        Console.WriteLine($"Value: {value}.");      

    }

    public static void PrintInputSecond(int? value = null)

    {

        value = value ?? 65;

        if (value is null)

        {

            Console.WriteLine("Empty.");

            return;

        }

​

        Console.WriteLine($"Value: {value}.");      

    }

}