class State
{
  float position;
  float velocity;
  
  State()
  {
    position = 0;
    velocity = 0;
  }
  
  boolean equals(State other)
  {
    return equal(position, other.position) && equal(velocity, other.velocity);
  }
  
  boolean compare(State other)
  {
    float threshold = 0.1;
    return abs(other.position - position) > threshold;
  }
  
  State clone()
  {
    State c = new State();
    c.position = position;
    c.velocity = velocity;
    return c;
  }
}