*     F16GLF Example Program Text
*     Mark 22 Release. NAG Copyright 2007.
*     .. Parameters ..
      INTEGER          NIN, NOUT
      PARAMETER        (NIN=5,NOUT=6)
      INTEGER          NMAX, INCMAX
      PARAMETER        (NMAX=10,INCMAX=NMAX)
*     .. Local Scalars ..
      COMPLEX *16      SUMVAL
      INTEGER          I, INCX, N
*     .. Local Arrays ..
      COMPLEX *16      X(1+(NMAX-1)*ABS(INCMAX))
*     .. External Functions ..
      COMPLEX *16      BLAS_ZSUM
      EXTERNAL         BLAS_ZSUM
*     .. Intrinsic Functions ..
      INTRINSIC        ABS
*     .. Executable Statements ..
      CONTINUE
*
      WRITE (NOUT,*) 'F16GLF/BLAS_ZSUM Example Program Results'
*
*     Skip heading in data file
*
      READ (NIN,*)
*
*     Read N and INCX from data file
*
      READ (NIN,*) N, INCX
*
      IF (N.LE.NMAX .AND. ABS(INCX).LE.INCMAX) THEN
*
*        Read X from data file
*
         READ (NIN,*) (X(I),I=1,1+(N-1)*ABS(INCX),INCX)
*
*        Sum the elements of X
*
         SUMVAL = BLAS_ZSUM(N,X,INCX)
*
         WRITE (NOUT,*)
         WRITE (NOUT,99999) SUMVAL
      END IF
*
99999 FORMAT (1X,'Sum of elements of X is (',F9.5,',',F9.5,')')
      END