対象の思考1

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;



namespace ConsoleApplication5

{

    class doubi

    {

        doubi d =new doubi();

        int flag;

        public doubi()

        {

            flag = 0;

            Console.WriteLine(d.flag);

        }

        private void put()

        {

            Console.WriteLine(d.flag);

        }

    }

    class Program

    {



        static void Main(string[] args)

        {

            doubi db = new doubi();

        }

    }

}