#!/usr/bin/env python

def r8_sign_opposite ( r1, r2 ):

#*****************************************************************************80
#
## R8_SIGN_OPPOSITE is TRUE if two R8's are not of the same sign.
#
#  Discussion:
#
#    This test could be coded numerically as
#
#      if ( r1 * r2 <= 0.0 ) then ...
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    25 July 2014
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, real R1, R2, the values to check.
#
#    Output, logical VALUE, is TRUE if ( R1 <= 0 and 0 <= R2 )
#    or ( R2 <= 0 and 0 <= R1 ).
#
  value = ( r1 <= 0.0 and 0.0 <= r2 ) or ( r2 <= 0.0 and 0.0 <= r1 )

  return value