Initializing an object by base class?

Question

OOP

Please tell me how to implement such a constructor:

Class Derived : BaseClass
{
  public Derived(BaseClass bc)
  {
  // Как быть дальше???
  }
}

Answer 1

Class Derived : BaseClass
{
  public Derived(BaseClass bc) : base (bc.x, bc.y, bc.z) // и т.д. и т.п
  {
  
  }
}