*     S15AGF Example Program Text
*     Mark 22 Release. NAG Copyright 2007.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
*     .. Local Scalars ..
      DOUBLE PRECISION X, Y
      INTEGER          IFAIL
*     .. External Functions ..
      DOUBLE PRECISION S15AGF
      EXTERNAL         S15AGF
*     .. Executable Statements ..
      WRITE (NOUT,*) 'S15AGF Example Program Results'
*
*     Skip heading in data file
*
      READ (NIN,*)
*
      WRITE (NOUT,*)
      WRITE (NOUT,*) '       X          ERFCX(X)    IFAIL'
      WRITE (NOUT,*)
*
   20 CONTINUE
*
      READ (NIN,*,END=40) X
*
      IFAIL = 1
*
      Y = S15AGF(X,IFAIL)
*
      IF (IFAIL.GE.0) THEN
         WRITE (NOUT,99999) X, Y, IFAIL
         GO TO 20
      ELSE
         WRITE (NOUT,99998) IFAIL
      END IF
*
   40 CONTINUE
*
99999 FORMAT (1X,1P,2(1X,E13.5),1X,I3)
99998 FORMAT (1X,' ** S15AGF returned with IFAIL = ',I5)
      END