using System;

public class Program

{

    public static void Main()

    {

        string message;

        CanRegister("unno", 18, true, false, out message);

        Console.WriteLine(message);

    }

    private static bool CanRegister(string name, int age, bool isMale, bool isMarried, out string message)

    {

        bool CanRegister = !isMarried && name.Length > 0 && ((age >= 18 && isMale) || (age >= 16 && !isMale));

        if (isMarried || name.Length > 0)

        {

            message = "登録できません";

            return CanRegister;

        }

​

        else if ((age >= 18 && isMale) || (age >= 16 && !isMale))

        {

            message = "何年か経てば登録できます";

            return CanRegister;

        }

​

        else message = "登録できます";

        return CanRegister;

    }

}