# include <math.h>
# include <stdio.h>
# include <stdlib.h>
# include <time.h>

# include "annulus_rule.h"

/******************************************************************************/

double r8_sign ( double x )

/******************************************************************************/
/*
  Purpose:

    r8_sign() returns the sign of an R8.

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    08 May 2006

  Author:

    John Burkardt

  Parameters:

    Input, double X, the number whose sign is desired.

    Output, double R8_SIGN, the sign of X.
*/
{
  double value;

  if ( x < 0.0 )
  {
    value = - 1.0;
  }
  else
  {
    value = + 1.0;
  }
  return value;
}