public void insert(int bno)
	{
		Node temp, fNode, parent;
		temp = new Node(bno);
		try
		{
			if(root == null)
			root = temp;
			else
			{
				fNode = root;
				while(true)
				{
					parent = fNode;
					if(bno < fNode.getbno())
					{
						fNode = fNode.getLeft();
						if(fNode==null)
						{
							parent.setLeft(temp);
							return;
						}
					}
					else
					{
						fNode = fNode.getRight();
						if(fNode==null)
						{
							parent.setRight(temp);
							return;
						}
					}
				}
			}
		}
		catch(Exception e)
		{
			System.out.println("Exception occured: "+e.getMessage());
			System.exit(0);
		}
	}