! (C) Copyright 2005- ECMWF.
!
! This software is licensed under the terms of the Apache Licence Version 2.0
! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
!
! In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
! virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
!
! Description: how to set key values.
!
!
program set_missing_fortran
   use eccodes
   implicit none
   integer              :: infile, outfile
   integer              :: igrib

   infile = 5
   outfile = 6

   call codes_open_file(infile, &
                        '../../data/reduced_gaussian_pressure_level.grib2', 'r')

   call codes_open_file(outfile, &
                        'out_surface_level.grib2', 'w')

   ! A new GRIB message is loaded from file
   ! igrib is the GRIB id to be used in subsequent calls
   call codes_grib_new_from_file(infile, igrib)

   call codes_set(igrib, 'typeOfFirstFixedSurface', 'sfc')
   call codes_set_missing(igrib, 'scaleFactorOfFirstFixedSurface')
   call codes_set_missing(igrib, 'scaledValueOfFirstFixedSurface')

   call codes_write(igrib, outfile)

   call codes_release(igrib)

   call codes_close_file(infile)

   call codes_close_file(outfile)

end program