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ningqicheng

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1.module typedef
2.  implicit none
3.  type :: datalink
4.    integer :: i
5.    type(datalink), pointer :: next
6.  end type datalink
7.end module typedef
8.
9.program ex1012
10.  use typedef
11.  implicit none
12.  type(datalink) , pointer :: p, head
13.  integer :: i,n,err
14.
15.  write(*,*) 'Input N:'
16.  read(*,*) n
17.
18.  allocate( head )
19.  head%i=1
20.  nullify(head%next)
21.
22.  p=>head
23.  do i=2,n
24.    allocate( p%next, stat=err )
25.    if ( err /= 0 ) then
26.      write(*,*) 'Out of memory!'
27.      stop
28.    end if
29.    p=>p%next
30.    p%i=i
31.  end do
32.  nullify(p%next)
33.
34.  p=>head
35.  do while(.true.)
36.    write(*, "(i5)" ) p%i
37.        if ( .not. associated(p%next) ) exit
38.    p=>p%next
39.  end do
40.
41.  stop
42.end program
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