c#

int rec_op(string n, List<string> op)
        {
            int larg = n.Length;
            Console.WriteLine(n);
            Console.WriteLine(op);

            if(larg == 2)
            {
                if(op[0] == "suma")
                {
                    return n[0] + n[1];
                }
                else if (op[0] == "resta")
                {
                    return n[0] - n[1];
                }
                else if (op[0] == "multi")
                {
                    return n[0] * n[1];
                }
                else
                {
                    return n[0] / n[1];
                }
            }
            else
            {
                if (op[0] == "suma")
                {
                    List<int> expr1 = new List<int>();
                    expr1=suma_list(n[0],rec_op())
                }
            }