1! Program to test the PACK intrinsic
2program intrinsic_pack
3   integer, parameter :: val(9) = (/0,0,0,0,9,0,0,0,7/)
4   integer, dimension(3, 3) :: a
5   integer, dimension(6) :: b
6
7   a = reshape (val, (/3, 3/))
8   b = 0
9   b(1:6:3) = pack (a, a .ne. 0);
10   if (any (b(1:6:3) .ne. (/9, 7/))) STOP 1
11   b = pack (a(2:3, 2:3), a(2:3, 2:3) .ne. 0, (/1, 2, 3, 4, 5, 6/));
12   if (any (b .ne. (/9, 7, 3, 4, 5, 6/))) STOP 2
13
14   call tests_with_temp()
15contains
16  subroutine tests_with_temp
17    ! A few tests which involve a temporary
18    if (any (pack(a, a.ne.0) .ne. (/9, 7/))) STOP 3
19    if (any (pack(a, .true.) .ne. val)) STOP 4
20    if (size(pack (a, .false.)) .ne. 0) STOP 5
21    if (any (pack(a, .false., (/1,2,3/)).ne. (/1,2,3/))) STOP 6
22
23  end subroutine tests_with_temp
24end program
25