countdigits.cs

using System;
using System.Collections.Generic;

class Digits {
  static int get_digits (decimal d) {
    if (d < 1) {
      return 0;
    } else {
      return 1 + get_digits (d / 10);
    }
  }

  static void Main (string [] args)
  {
    Console.WriteLine ("Digits: ");

    /* add some test values */
    List<String> test_values = new List<String> ();
    test_values.Add ("999999999999998");
    test_values.Add ("999999999999999");
    test_values.Add ("9999999999999939");

    for (int i = 0; i < args.Length; i++) {
      Console.Write (args[i]);
      Console.Write (": ");

      decimal d = Convert.ToDecimal (args[i]);
      Console.WriteLine (get_digits (d));
    }

    Console.WriteLine ("Predef values:");
    args = test_values.ToArray();
    for (int i = 0; i < args.Length; i++) {
      Console.Write (args[i]);
      Console.Write (": ");

      decimal d = Convert.ToDecimal (args[i]);
      Console.WriteLine (get_digits (d));
    }
  }

}