1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
program link
implicit none
type node
character(20) name
integer id
integer score
type(node),pointer ::next
end type
integer,parameter::num=3
type(node),pointer ::students
call init_all(students,num)
call show_all(students)
print*,"now,we add a student"
call add_node(students)
call show_all(students)
print*,"now,we delete the student"
call del_node(students)
call show_all(students)
contains
subroutine add_node(pos)
type(node),pointer ::pos,tmp
allocate(tmp)
tmp%name="abc"
tmp%id=1
tmp%score=100
print*,"please input name,id,end score of one students"
read*,tmp%name,tmp%id,tmp%score
if(associated(pos%next)) then
tmp%next=>pos%next
pos%next=>tmp
else
nullify(tmp%next)
pos%next=>tmp
end if
end subroutine
subroutine del_node(pos)
type(node),pointer ::pos,next
next=>pos%next
if(associated(next%next)) then
pos%next=>next%next
deallocate(next)
else
nullify(pos%next)
deallocate(next)
end if
end subroutine
subroutine show_all(pos)
type(node),pointer ::pos,tmp
integer ::cnt
cnt=1
print*,"all students are:"
tmp=>pos
do while(associated(tmp))
print*,cnt,"th ",tmp%name,tmp%id,tmp%score
tmp=>tmp%next
cnt=cnt+1
end do
end subroutine
subroutine init_all(pos,num)
type(node),pointer ::pos,tmp,walk
integer num
integer i
allocate(tmp)
nullify(tmp%next)
call add_node(tmp)
pos=>tmp%next
deallocate(tmp)
walk=>pos
do i=1,num-1
call add_node(walk)
walk=>walk%next
end do
end subroutine
end program link
|