> See http://www.pcc.qub.ac.uk/tec/courses/f77tof90/stu-notes/f90studentMIF_6.html
> for code which creates, traverses and destroys a linked list. Note
> that this is a stack - last in - first out.
>
> I found the code a bit quirky and decided to write my own so that the
> list would be traversed in the order in which items were entered. So I
> sat down and wrote out the following on a legal pad. It compiled and
> ran on the first try!
>
> program linked_list
> implicit none
>
> type node
> integer :: i
> type(node), pointer :: p
> end type node
>
> type(node), pointer :: h, t, c
>
> integer :: i
>
> nullify(h)
>
> do
> read *, i
> if ( i == 0 ) exit
>
> allocate(c)
> c%%i = i
> nullify(c%%p)
>
> if ( .not. associated(h) ) then
> h => c
> else
> t%%p => c
> end if
>
> t => c
> end do
>
> do
> c => h
> if ( .not. associated(c) ) then
> exit
> else
> print *, c%%i
> h => c%%p
> deallocate(c)
> end if
> end do
>
> end program linked_list
>
> I acutally understand what this code does! The only subtle part is
>
> t%%p => c
>
> --- If the list is NOT empty, add the newly created node onto the
> chain.
>
> -- e