//in parameterized constructor
a = new char*[height+3];
for(int i = 0; i < height+3; i++)
{a[i] = new char[width+2];}
~destructor
		 for (int i = 0; i < height+3; ++i)
			delete [] a[i];
		delete [] a;
//elsewhere
piece *current_piece; //both initialized to nullptr
piece *next_piece;

void Game::update()
{
if(current_piece==nullptr && next_piece==nullptr)
	{
	switch (randPieceType())
	{
	  case PIECE_I:
	    current_piece=new I();// make the next piece an I piece
	    break;
	  case PIECE_L:
	   current_piece=new L(); // make the next piece an L piece
	    break;
	 case PIECE_J:
	   current_piece=new J(); // make the next piece an L piece
	    break;
		case PIECE_T:
	   current_piece=new T(); // make the next piece an L piece
	    break;
		case PIECE_O:
	   current_piece=new O(); // make the next piece an L piece
	    break;
		case PIECE_S:
	   current_piece=new S(); // make the next piece an L piece
	    break;
		case PIECE_Z:
	   current_piece=new Z(); // make the next piece an L piece
	    break;
	}

	}
else
	{	delete current_piece;
		current_piece=next_piece;
	}
if(!next_piece)
{
delete next_piece;
}
switch (randPieceType())
	{
	  case PIECE_I:
	    next_piece=new I();// make the next piece an I piece
	    break;
	  case PIECE_L:
	   next_piece=new L(); // make the next piece an L piece
	    break;
	 case PIECE_J:
	   next_piece=new J(); // make the next piece an L piece
	    break;
		case PIECE_T:
	   next_piece=new T(); // make the next piece an L piece
	    break;
		case PIECE_O:
	   next_piece=new O(); // make the next piece an L piece
	    break;
		case PIECE_S:
	   next_piece=new S(); // make the next piece an L piece
	    break;
		case PIECE_Z:
	   next_piece=new Z(); // make the next piece an L piece
	    break;
	}
}
//destructor
~Game(){delete next_piece; delete current_piece;}

// transition between levels
delete current_piece;  delete next_piece; incode