trait Printable // putin ca o interfata sau o clasa abstracta
{
  var log : string
  method Print()
}
  
class Cell extends Printable
{
  var x : int
  method Print()
  {
    print log;
    print x;
  }
}

// nu pot extinde o clasa
// class Cell' extends Cell
// {
// }

class Rational extends Printable
{
  var n : int
  var m : int

  method Print()
  {
    print log;
    print n, "/", m;
  }
}

// nu exista protected, public, private

trait Complex
{
  method getX() returns (r : real)
  method getY() returns (r : real)
  method getAngle() returns (r : real)
  method getAmplitude() returns (r : real)
}

class Complex1 extends Complex
{
  var x : real
  var y : real
  constructor()
  {
    x := 0 as real;
    y := 0 as real;
  }
  method getX() returns (r : real)
  {
    return x;
  }
  method getY() returns (r : real)
  {
    return y;
  }
  method getAngle() returns (r : real)
  {
    return 0.0; // ar trebui calculat mai complicat
  }
  method getAmplitude() returns (r : real)
  {
    return 0.0; // ar trebui calculat mai complicat
  }
}

class Complex2 extends Complex
{
  var unghi : real
  var magnitudine : real
  constructor()
  {
    unghi := 0 as real;
    magnitudine := 0 as real;
  }
  method getX() returns (r : real)
  {
    return 0 as real;
    //return magnitudine * cos(unghi);
  }
  method getY() returns (r : real)
  {
    return 0 as real;
    //    return y;
  }
  method getAngle() returns (r : real)
  {
    return unghi;
  }
  method getAmplitude() returns (r : real)
  {
    return magnitudine;
  }
}

method exempluClient()
{
  var c : Complex := new Complex1();
  var d : Complex := new Complex2();
  var a := c.getX();
  var b := d.getY();
}