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! Program to test the PACK intrinsic

program intrinsic_pack

   integer, parameter :: val(9) = (/0,0,0,0,9,0,0,0,7/)

   integer, dimension(3, 3) :: a

   integer, dimension(6) :: b

   a = reshape (val, (/3, 3/))

   b = 0

   b(1:6:3) = pack (a, a .ne. 0);

   if (any (b(1:6:3) .ne. (/9, 7/))) call abort

   b = pack (a(2:3, 2:3), a(2:3, 2:3) .ne. 0, (/1, 2, 3, 4, 5, 6/));

   if (any (b .ne. (/9, 7, 3, 4, 5, 6/))) call abort

   call tests_with_temp()

contains

  subroutine tests_with_temp

    ! A few tests which involve a temporary

    if (any (pack(a, a.ne.0) .ne. (/9, 7/))) call abort

    if (any (pack(a, .true.) .ne. val)) call abort

    if (size(pack (a, .false.)) .ne. 0) call abort

    if (any (pack(a, .false., (/1,2,3/)).ne. (/1,2,3/))) call abort

  end subroutine tests_with_temp

end program