#!/usr/bin/env python

def r8_sign3 ( x ):

#*****************************************************************************80
#
## R8_SIGN3 returns the three-way sign of an R8.
#
#  Discussion:
#
#    The value is +1 if the number is positive, 0 if zero, and -1 otherwise.
#
#  Licensing:
#
#    This code is distributed under the GNU LGPL license.
#
#  Modified:
#
#    28 September 2014
#
#  Author:
#
#    John Burkardt
#
#  Parameters:
#
#    Input, real X, the number whose sign is desired.
#
#    Output, real VALUE, the sign of X.
#
  if ( x < 0.0 ):
    value = -1.0
  elif ( x == 0.0 ):
    value = 0.0;
  else:
    value = +1.0
 
  return value