#! /usr/bin/env python
#
def i4_swap ( x, y ) :

#*****************************************************************************80
#
## I4_SWAP swaps two I4's.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    09 May 2013
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, integer X, Y, two values to interchange.
#
#    Output, integer X, Y, the interchanged values.
#
  return y, x

def i4_swap_test ( ):

#*****************************************************************************80
#
## I4_SWAP_TEST tests I4_SWAP.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    28 September 2014
#
#  Author:
#
#    John Burkardt
#
  import platform

  print ( '' )
  print ( 'I4_SWAP_TEST' )
  print ( '  Python version: %s' % ( platform.python_version ( ) ) )
  print ( '  I4_SWAP swaps two I4\'s.' )

  i = 1
  j = 202

  print ( '' )
  print ( '  Before swapping: ' )
  print ( '' )
  print ( '  I = %d' % ( i ) )
  print ( '  J = %d' % ( j ) )

  i, j = i4_swap ( i, j )

  print ( '' )
  print ( '  After swapping: ' )
  print ( '' )
  print ( '  I = %d' % ( i ) )
  print ( '  J = %d' % ( j ) )
#
#  Terminate.
#
  print ( '' )
  print ( 'I4_SWAP_TEST' )
  print ( '  Normal end of execution.' )
  return

if ( __name__ == '__main__' ):
  from timestamp import timestamp
  timestamp ( )
  i4_swap_test ( )
  timestamp ( )