#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2010 Doug Hellmann.  All rights reserved.
#
"""Testing for not-a-number.
"""
#end_pymotw_header

import math

x = (10.0 ** 200) * (10.0 ** 200)
y = x/x

print 'x =', x
print 'isnan(x) =', math.isnan(x)
print 'y = x / x =', x/x
print 'y == nan =', y == float('nan')
print 'isnan(y) =', math.isnan(y)