program merger
!
!*******************************************************************************
!
!! MERGER merges two sorted files into a third.
!
!
!  Usage:
!
!    merger input1 input2 output
!
!  Discussion:
!
!    No check is made that the file is already sorted, and the program
!    will become seriously confused if it is not.
!
!    Duplicate entries are removed.
!
!  Modified:
!
!    18 February 2002
!
!  Author:
!
!    John Burkardt
!
  implicit none
!
  character ( len = 256 ) dict_file_name_1
  character ( len = 256 ) dict_file_name_2
  character ( len = 256 ) dict_file_name_3
  integer iarg
  integer iargc
  integer ierror
  integer ilen
  integer ipxfargc
  integer n1
  integer n2
  integer n3
  integer numarg
!
  call timestamp ( )
!
!  Count the number of command line arguments.
!
!  Old style:
!
  numarg = iargc ( )
!
!  New style:
!
! numarg = ipxfargc ( )
!
!  Get the module name.
!
  if ( numarg < 3 ) then
    write ( *, '(a)' ) ' '
    write ( *, '(a)' ) 'MERGER - Not enough arguments!'
    write ( *, '(a)') '  Usage:   merger  infile1  infile2  outfile'
    stop
  end if

  iarg = 1
!
!  Old style:
!
  call getarg ( iarg, dict_file_name_1 )
!
!  New style:
!
! call pxfgetarg ( iarg, dict_file_name_1, ilen, ierror )
!
! if ( ierror /= 0 ) then
!   write ( *, '(a)' ) ' '
!   write ( *, '(a)' ) 'MERGER - Fatal error!'
!   write ( *, '(a)' ) '  Unable to read command line argument #1.'
!   stop
! end if

  iarg = 2
!
!  Old style:
!
  call getarg ( iarg, dict_file_name_2 )
!
!  New style:
!
! call pxfgetarg ( iarg, dict_file_name_2, ilen, ierror )
!
! if ( ierror /= 0 ) then
!   write ( *, '(a)' ) ' '
!   write ( *, '(a)' ) 'MERGER - Fatal error!'
!   write ( *, '(a)' ) '  Unable to read command line argument #2.'
!   stop
! end if

  iarg = 3
!
!  Old style:
!
  call getarg ( iarg, dict_file_name_3 )
!
!  New style:
!
! call pxfgetarg ( iarg, dict_file_name_3, ilen, ierror )
!
! if ( ierror /= 0 ) then
!   write ( *, '(a)' ) ' '
!   write ( *, '(a)' ) 'MERGER - Fatal error!'
!   write ( *, '(a)' ) '  Unable to read command line argument #3.'
!   stop
! end if

  call file_merge ( dict_file_name_1, dict_file_name_2, dict_file_name_3, &
    n1, n2, n3 )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'MERGER:'
  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  Words in file1: ', n1
  write ( *, '(a,i8)' ) '  Words in file2: ', n2
  write ( *, '(a,i8)' ) '  Words in file3: ', n3
  write ( *, '(a)' ) ' '
  write ( *, '(a,i8)' ) '  Duplicates:	', n1 + n2 - n3

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'MERGER:'
  write ( *, '(a)' ) '  Normal end of execution.'

  stop
end
subroutine timestamp ( )
!
!*******************************************************************************
!
!! TIMESTAMP prints the current YMDHMS date as a time stamp.
!
!
!  Example:
!
!    May 31 2001   9:45:54.872 AM
!
!  Modified:
!
!    31 May 2001
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    None
!
  implicit none
!
  character ( len = 8 ) ampm
  integer d
  character ( len = 8 ) date
  integer h
  integer m
  integer mm
  character ( len = 9 ), parameter, dimension(12) :: month = (/ &
    'January  ', 'February ', 'March    ', 'April    ', &
    'May      ', 'June     ', 'July     ', 'August   ', &
    'September', 'October  ', 'November ', 'December ' /)
  integer n
  integer s
  character ( len = 10 )  time
  integer values(8)
  integer y
  character ( len = 5 ) zone
!
  call date_and_time ( date, time, zone, values )

  y = values(1)
  m = values(2)
  d = values(3)
  h = values(5)
  n = values(6)
  s = values(7)
  mm = values(8)

  if ( h < 12 ) then
    ampm = 'AM'
  else if ( h == 12 ) then
    if ( n == 0 .and. s == 0 ) then
      ampm = 'Noon'
    else
      ampm = 'PM'
    end if
  else
    h = h - 12
    if ( h < 12 ) then
      ampm = 'PM'
    else if ( h == 12 ) then
      if ( n == 0 .and. s == 0 ) then
        ampm = 'Midnight'
      else
        ampm = 'AM'
      end if
    end if
  end if

  write ( *, '(a,1x,i2,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
    trim ( month(m) ), d, y, h, ':', n, ':', s, '.', mm, trim ( ampm )

  return
end