using System;

class SeqApp {

  public static void Main(){

    IntSequence isq = 
      new IntCompSeq(
            new IntCompSeq(
              new IntInterval(3,5), new IntSingular(-7) ),
            new IntCompSeq(
              new IntInterval(12,7), new IntCompSeq(
                                           new IntInterval(18,-18),
                                           new IntInterval(3,5)
                                           )));
    Visitor min = new MinVisitor();
    Visitor max = new MaxVisitor();
    Visitor sum = new SumVisitor();


    Console.WriteLine("Min: {0} Max: {1}", isq.Accept(min),
                                           isq.Accept(max));

//  Alternative activation of Visit methods:
//  Console.WriteLine("Min: {0} Max: {1}", min.Visit((IntCompSeq)isq), 
//                                         max.Visit((IntCompSeq)isq));

    Console.WriteLine("Sum: {0}", isq.Accept(sum));
  }
}