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

typedef struct Node
{
    int data;
    struct Node *next;
}Node, *LNode;

LNode In_link(LNode head);
void Display_link(LNode head);
void Free_link(LNode head);

int main()
{
    LNode head = NULL, top = NULL;

    head = In_link(head);
    Display_link(head);
    putchar(10);

    top = In_link(top);
    Display_link(top);
    putchar(10);

    Free_link(head);
    Free_link(top);

    return 0;
}

LNode In_link(LNode head)
{
    int num;
    Node *link = NULL, *incept_link = NULL;

    printf("Please input the number:");
    scanf("%d", &num);
    while(num)
    {
        link = (Node *)malloc(sizeof(Node));
        link->data = num;
        if(head == NULL)
            head = link;
        else
            incept_link->next = link;
        incept_link = link;
        scanf("&d", &num);
    }
    if(incept_link != NULL)
        incept_link->next = NULL;
 
    return head;
}

void Display_link(LNode head)
{
    Node *incept_link = NULL;

    if(head == NULL)
    {
        printf("The link is empty!\n");
        return;
    }

    incept_link = head;
    while(incept_link)
    {
        printf("%3d", incept_link->data);
        incept_link = incept_link->next;
    }
}

void Free_link(LNode head)
{
    if(head == NULL)
    {
        printf("The link is empty!\n");
        return;
    }

    if(head->next)
        Free_link(head->next);
    Free_link(head);
}

不会啊，这不是无穷递归啊，以前有试过的··

楼上的哥们，表示抱歉，我犯了低级错误，格式控制符打错了
 scanf("&d", &num);
请原谅啦
其他的没有错误！！！

恩，对了，应该是这样的
void Free_link(LNode head)
{
    if(head == NULL)
    {
        printf("The link is empty!\n");
        return;
    }

    if(head->next)
        Free_link(head->next);
    free(head);
}
谢谢你啦，是我疏忽了，以后多交流！！！