Код 2 лаба

class Program
{
static void Main()
{
var check = new Wating();
var call = new Call();
var end = new Talk();
call.AnswerCall();
end.EndCall();
}
}

class Check
{
public int number;
public double balance;
public void BuyMinutes()
{
balance++;
}
}

class Stateline : Check
{
public static bool LineIsBusy = false;
public static void Update()
{
if (LineIsBusy is true)
{
LineIsBusy = false;
}
else
{
LineIsBusy = true;
}
}
}

class Wating : Stateline
{
public void Call()
{
Stateline.Update();
}
}

class Talk : Stateline
{
public void EndCall()
{
Stateline.Update();
}
}

class Call : Stateline
{
public void AnswerCall()
{
Stateline.Update();
}
public void EndCall()
{
Stateline.Update();
}
}