using System;

​

public class Program

{

    public static void Main()

    {

        a aa = new a(3);

        Console.WriteLine(aa.b.ToString());

        lol(ref aa, 4);

        Console.WriteLine(aa.b.ToString());

    }

​

    public struct a

    {

        public int b { get ;set;} 

        public int c;

​

        public a(int bb)

        {

            b = 0;

            c = 0;

        }

    }

​

    public static void lol(ref a aa, int c)

    {

        aa.c = c;

    }

}

​

​