loudenvier

public class Pis
{
  static int[] multi = { 3, 2, 9, 8, 7, 6, 5, 4, 3, 2 };

  public static int CalculaDigito(string pis) {
    var m11 = multi.Zip(pis, (m, d) => m * (int)Char.GetNumericValue(d)).Sum() % 11;
    return m11 < 2 ? 0 : 11 - modulo11;
  }
}