Function            rsign - determine the sign of a REAL number

  Syntax              int rsign(struct REAL rx);

  Prototype in        real.h

  Remarks             rsign will determine the sign of rx. Zero is
                      considered positive.

                      Refer to the section SIMULATED FP MATH for further
                      details.

  Return value        returns -1 if rx is negative, otherwise 1.

  See also            _r_minpre, _rmatherr
                      radd(), rceil(), rdiv(), rfloor(), rnegate(),
                      rnormalize(), rsub()