using PropertiesIndexersRefOut;

Triple t1 = new Triple
{
  First = 456,
  Second = 789
};

Triple t2 = new Triple
{
  First = 1000,
  Second = 2000
};

Console.WriteLine("t1 + t2 = " + (t1 + t2));

CreateRandomTriple(t1, ref t2, out Triple t3);

Console.WriteLine("t1 = " + t1);
Console.WriteLine("t2 = " + t2);
Console.WriteLine("t3 = " + t3);

Console.WriteLine(t1["A", 1]);
Console.WriteLine(t1["B", 2]);
Console.WriteLine(t1["B", 3]);

PrintTriples(t1, t2, t3);

void PrintTriples(params Triple[] triples)
{
  foreach (var t in triples)
  {
    Console.WriteLine(t);
  }
}

void CreateRandomTriple(Triple t1, ref Triple t2, out Triple t3)
{
  Random r = new Random();
  t3 = new Triple
  {
    First = r.Next(t1.First, t2.Second),
    Second = r.Next(maxValue: t2.Second, minValue: t1.First)
  };

  t1 = t3;
  t2 = t3;
}