数据结构 单链表的头插法和尾插法

头插法核心代码：

q->data = e;
q->next = p->next;
p->next = q;

 

尾插法核心代码：

q->data = e;
q->next = NULL;
p->next = q;

主函数代码：

#include "LinkList.h"
#include 
#include 
void print(ElemType e)
{
    printf("%d ", e);
}

int FirstInsert(Node *l, ElemType e)
{
    Node *p = l;

    if(NULL == l)
    {
        return FAILURE;
    }

    if(NULL == p)
    {
        return FAILURE;
    }

    Node *q = (Node *)malloc(sizeof(Node) * 1);
    if(NULL == q)
    {
        return FAILURE;
    }

    q->data = e;
    q->next = p->next;
    p->next = q;

    return SUCCESS;
}

int FinalInsert(Node *l, ElemType e)
{
    Node *p = l;

    if(NULL == l)
    {
        return FAILURE;
    }

    while(p->next != NULL)
    {
        p = p->next;
    }

    if(p == NULL)
    {
        return FAILURE;
    }

    Node *q = (Node *)malloc(sizeof(Node) * 1);
    if(NULL == q)
    {
        return FAILURE;
    }

    q->data = e;
    q->next = NULL;
    p->next = q;

    return SUCCESS;
}

int main()
{
    Node *first = NULL;
    int i, ret, num;
    srand(time(NULL));

    if(LinkInit(&first) == FAILURE)
    {
        printf("Init Failure!\n");
    }

    /*头插*/
    for(i = 0; i < 8; i++)
    {
        scanf("%d", &num);
        FirstInsert(first, num);
        if(ret == FAILURE)
        {
            printf("Insert Failure!\n");
        }
        else
        {
            printf("Insert Success!\n");
        }
    }

    /*遍历*/
    ret = LinkTraverse(first, print);
    if(ret == FAILURE)
    {
        printf("\nTraverse Failure!\n");
    }
    else
    {
        printf("\nTraverse Success!\n");
    }

    /*清空*/
    ret = LinkClear(first);
    if(ret == SUCCESS)
    {
        printf("Clear Success!\n");
    }
    else
    {
        printf("Clear Failure!\n");
    }

    /*尾插*/
    for(i = 0; i < 10; i++)
    {
        scanf("%d", &num);
        FinalInsert(first, num);
        if(ret == FAILURE)
        {
            printf("Insert Failure!\n");
        }
        else
        {
            printf("Insert Success!\n");
        }
    }
    
    /*遍历*/
    ret = LinkTraverse(first, print);
    if(ret == FAILURE)
    {
        printf("\nTraverse Failure!\n");
    }
    else
    {
        printf("\nTraverse Success!\n");
    }

    /*清空*/
    ret = LinkClear(first);
    if(ret == SUCCESS)
    {
        printf("Clear Success!\n");
    }
    else
    {
        printf("Clear Failure!\n");
    }

    return 0;

}

初始化, 清空和遍历调用文章《数据结构 单链表》中的LinkList.c代码, 头文件调用文章《数据结构 单链表》中的LinkList.h