public static void AddQueen(int xIndex, int yIndex, String[][]board, Stack<String> Que){
		
		// to place a Q where a queen is on the board.
		board[yIndex][xIndex] = " Q |";

		// to put a new queen into the stack
		Que.push("row" + Integer.toString(yIndex) + " " + "column" + Integer.toString(xIndex));
	}