static void Main(string[] args)
        {
            meth2 m2        = new meth2();
            int   result_m2 = m2.CallFuncsClass(3);

            Console.WriteLine(result_m2);
            Console.ReadKey();
        }
        static void Main(string[] args)
        {
            meth1 m1 = new meth1();
            meth2 m2 = new meth2();

            m2.CallFuncsClass(3);
            int result_m1 = m1.op1;

            Console.WriteLine(result_m1);
            Console.ReadKey();
        }