#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Checking for overflow or infinite values.
     """
     #end_pymotw_header
     
     import math
     
     print '{:^3}  {:6}  {:6}  {:6}'.format('e', 'x', 'x**2', 'isinf')
     print '{:-^3}  {:-^6}  {:-^6}  {:-^6}'.format('', '', '', '')
     
     for e in range(0, 201, 20):
         x = 10.0 ** e
         y = x*x
         print '{:3d}  {!s:6}  {!s:6}  {!s:6}'.format(e, x, y, math.isinf(y))