static void Main(string[] args)
        {
            classa a = new classa();

            a.addition();

            classa a1 = new classa();

            a1.myMethod2();

            classb b = new classb();

            b.final();

            classc c1 = new classc();

            c1.output();

            newclass n = new newclass();

            n.mymethodnew();
        }
        public void final()
        {
            classb b1 = new classb();

            b1.mymethod3();
        }