*     S15DDF Example Program Text
*     Mark 14 Release. NAG Copyright 1989.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
*     .. Local Scalars ..
      COMPLEX *16      W, Z
      INTEGER          IFAIL
*     .. External Functions ..
      COMPLEX *16      S15DDF
      EXTERNAL         S15DDF
*     .. Executable Statements ..
      WRITE (NOUT,*) 'S15DDF Example Program Results'
*     Skip heading in data file
      READ (NIN,*)
      WRITE (NOUT,*)
      WRITE (NOUT,*) '              Z                                W'
   20 READ (NIN,*,END=40) Z
      IFAIL = 1
*
      W = S15DDF(Z,IFAIL)
*
      IF (IFAIL.GE.0) THEN
         WRITE (NOUT,99999) Z, W
         GO TO 20
      ELSE
         WRITE (NOUT,99998) IFAIL
      END IF
   40 CONTINUE
*
99999 FORMAT (1X,'(',F12.4,',',F12.4,')      (',F12.4,',',F12.4,')')
99998 FORMAT (1X,' ** S15DDF returned with IFAIL = ',I5)
      END