Function            radd - add two REAL numbers

  Syntax              struct REAL radd(struct REAL val, struct REAL sval,
                                       int precision);

  Prototype in        real.h

  Remarks             val and sval are added together. The result will
                      have precision decimal places. See rsub() for more
                      details.

  Return value        returns val plus sval to the specified precision.
                      See rsub() for further details.

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