单链表基本操作代码

#include <stdio.h>
#include <stdlib.h>

#include <stdio.h>
#include <stdlib.h>

typedef struct List
{
    struct List *next;
    int data;
}List;

List *creatList(int *arr, int len)
{
    List *head, *p;
    List *s;
    int i;
    
    head = (List *)malloc(sizeof(List));
    head->next = NULL;
    p = head;
    
    for(i = 0; i < len; i++)
    {
        s = (List *)malloc(sizeof(List));
        s->data = arr[i];
        
        s->next= p->next;
        p->next = s;
        p = s;
    }
    p->next = NULL;
    head = head->next;
    
    return head;
}

//insert node before value.
List *insertNodeBefore(List *list, int value)
{
    List *p, *q;
    List *node;
    
    p = list;
    while(NULL != p && p->data != value)
    {
        q = p;
        p = p->next;
    }
    
    if(NULL == p)
    {
        printf("list has nod %d!\n", value);
        return list;
    }
    node = (List *)malloc(sizeof(List));
    node->data = 0;
    
    node->next = p;
    q->next = node;
            
    return list;
}

List *deleteNode(List *list, int value)
{
    List *p, *q;
    
    p = list;
    while(NULL != p && p->data != value)
    {
        q = p;
        p = p->next;    
    }
    if(NULL == p)
    {
        printf("list has not %d\n", value);
        return list;
    }
    q->next= p->next;
    free(p);
    
    return list;
}

List *revList(List *list)
{
    List *p1 = list;
    List *p2 = list;
    List *p3 = list;
    
    if(NULL == list || NULL == list->next)
    {
        printf("list is Null!\n");
        return list;
    }
    p2 = p1->next;
    while(NULL != p2)
    {
        p3 = p2->next;
        p2->next = p1;
        p1 = p2;
        p2 = p3;    
    }
    list->next = NULL; 
    list = p1; 
    
    return list;     
}

void printList(List *list)
{
    if(NULL == list)
    {
        printf("list is NULL!\n");
        return;
    }    
    while(NULL != list)
    {
        printf("%d\n", list->data);
        list = list->next;
    }
}

void freeList(List *list)
{
    List *head;
    
    head = list;
    while(NULL != head)
    {
        list = head->next;
        free(head);
        head = list;
    }
    free(list);
}

int main(int argc, char *argv[])
{
    int arr[] = {3,5,6,2,8,10};
    List *list;
    
    list = creatList(arr, 6);
    printf("=========createList=========\n");
    printList(list);
    printf("=========createList=========\n");
    
    list = insertNodeBefore(list, 8);
    printf("=========insertNodeList=========\n");
    printList(list);
    printf("=========insertNodeList=========\n");
    
    list = deleteNode(list, 5);
    printf("=========deleteList=========\n");
    printList(list);
    printf("=========deleteList=========\n");
    
    list = revList(list);
    printf("=========revList=========\n");
    printList(list);
    printf("=========revList=========\n");
    
    freeList(list);
    
    return 0;
}