#!/usr/local/bin/python
# coding: iso-8859-1
# Copyright © 2009 by Amos Newcombe
# 
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.

import math

def round(x):
	'round x to nearest integer; if two nearest integers, use the even one'
	xN = math.floor(x)
	xF = x - xN
	if   xF < 0.5     : pass     # round down
	elif xF > 0.5     : xN += 1  # round up
	elif xN % 2 == 0.0: pass     # round down to even number
	else              : xN += 1  # round up   to even number
	return int(xN)