单链表选择排序（C）

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #define LEN sizeof(struct A)
 4 
 5 struct A
 6 {
 7     int num;
 8     struct A *next;
 9 };
10 struct A *creat(void)//创建链表
11 {
12     struct A *head, *p1, *p2;
13     int n, i = 0;
14     scanf("%d", &n);
15     p1 = p2 = (struct A*)malloc(LEN);
16     scanf("%d", &p1->num);
17     head = NULL;
18     while (i <n)
19     {
20         i = i + 1;
21         if (i == 1)
22             head = p1;
23         else
24             p2->next = p1;
25         p2 = p1;
26         if (i <n)
27         {
28 
29             p1 = (struct A*)malloc(LEN);
30             scanf("%d", &p1->num);
31         }
32     }
33     p2->next = NULL;
34     return head;
35 }
36 struct A *selectsort(struct A *head)//选择排序
37 {
38     struct A *cur, *p, *q;
39     cur = head;
40     int a = 0, b = 0;
41     if (cur == NULL)
42         return NULL;
43     while (cur != NULL)
44     {
45         p = cur->next;
46         q = cur->next;
47         a = cur->num;
48         b = a;
49         while (p != NULL)
50         {
51             if (b>p->num)
52             {
53                 b = p->num;
54                 q = p;
55             }
56             p = p->next;
57         }
58         if (a != b)
59         {
60             q->num = a;
61             cur->num = b;
62         }
63         cur = cur->next;
64     }
65     return head;
66 }
67 void print(struct A *head)//打印链表
68 {
69     struct A *p;
70     p = head;
71     if (head != NULL)
72     {
73         do
74         {
75             printf("%d ", p->num);
76             p = p->next;
77         } while (p != NULL);
78     }
79 }
80 int main()
81 {
82     struct A *head = creat();
83     selectsort(head);
84     print(head);
85     return 0;
86 }