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/* ** Copyright UCAR (c) 1990 - 2016                                         */
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/*************************************************************************
 * usign.c - math utilities library
 *
 * returns +1 if arg is non-negative, -1 if negative
 *
 * Mike Dixon RAP NCAR Boulder CO USA
 *
 * December 1990
 *
 ***************************************************************************/

#include <rapmath/umath.h>

int usign(double x)

{

  if (x < 0)
    return (-1);
  else
    return(1);

}