頭插法和尾插法創建單鏈表

//頭插法創建單鏈表 
#include <stdio.h>
#include <malloc.h>

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

LinkList HeadInsert(LinkList &);    //頭插法創建單鏈表 
void output(LinkList);  //遍歷輸出 

int main(void){
    LinkList L;
    HeadInsert(L);
    output(L);
    return 0;
} 

//頭插法創建單鏈表 
LinkList HeadInsert(LinkList &L){
    L = (Node *)malloc(sizeof(Node));
    L->next = NULL;
    int e;
    scanf("%d",&e);
    while(e != -1){     //輸入-1表示結束輸入 
        Node *s = (Node *)malloc(sizeof(Node));
        s->data = e;
        s->next = L->next;
        L->next = s;
        scanf("%d",&e);
    }
    return L;
}

//遍歷輸出 
void output(LinkList L){
    Node *p = L->next;
    while(p != NULL){
        printf("%d ",p->data);
        p = p->next;
    }
}

//尾插法創建單鏈表 
#include <stdio.h>
#include <malloc.h>

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

LinkList TailInsert(LinkList &);    //尾插法創建單鏈表 
void output(LinkList);  

int main(void){
    LinkList L;
    TailInsert(L);
    
    output(L);
    return 0;
}


LinkList TailInsert(LinkList &L){       //尾插法創建單鏈表 
    L = (Node *)malloc(sizeof(Node));
    Node *r = L;
    int e;
    scanf("%d",&e);
    while(e != -1){        //輸入-1表示結束輸入 
        Node *s = (Node *)malloc(sizeof(Node));
        s->data = e;
        r->next = s;
        r = s;
        scanf("%d",&e);
    }
    r->next = NULL;
    return L;
}

//遍歷輸出 
void output(LinkList L){
    Node *p = L->next;
    while(p != NULL){
        printf("%d ",p->data);
        p = p->next;
    }
}