这个有头结点链表哪里错了，好像结点没有连上，不加头结点最多一个结点，end指向最后一个结点

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct LinkList
{
int m_Num;
struct LinkList*next;
}List;
void showMenu()
{
printf("**************\n");
printf("**1.添加节点**\n");
printf("**2.遍历链表**\n");
printf("**3.查找节点**\n");
printf("**4.删除节点**\n");
printf("**5.插入节点**\n");
printf("**************\n");
}
void addList(List*end,List*head)
{
end->next=(List*)malloc(sizeof(List));
end=end->next;
printf("请输入该节点编号：");
scanf("%d",&end->m_Num);
end->next=NULL;
(head->m_Num)++;
printf("成功添加节点");
}
void scanList(List*head)
{
if(head->m_Num==0) printf("当前链表没有节点");
else
{
List*tmp=head->next;
printf("当前共有%d个节点\n",head->m_Num);
while(tmp!=NULL)
{
printf("%d\n",tmp->m_Num);
tmp=tmp->next;
}
}
}
int main()
{
List*head=(List*)malloc(sizeof(List));
head->next=NULL;
List*end=head;
head->m_Num=0;
int choose=0;
while(1)
{
showMenu();
scanf("%d",&choose);
switch(choose)
{
case 1:
{
addList(end,head);
system("pause");
system("cls");
}
break;
case 2:
{
scanList(head);
system("pause");
system("cls");
}
break;
case 3:
break;
default:
break;
}
}
return 0;
}

你创建节点的时候每次返回end就好了，这样就不会丢失了

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct LinkList
{
    int m_Num;
    struct LinkList*next;
} List;
void showMenu()
{
    printf("**************\n");
    printf("**1.添加节点**\n");
    printf("**2.遍历链表**\n");
    printf("**3.查找节点**\n");
    printf("**4.删除节点**\n");
    printf("**5.插入节点**\n");
    printf("**************\n");
}
List* addList(List*end,List*head)
{
    end->next=(List*)malloc(sizeof(List));
    end=end->next;
    printf("请输入该节点编号：");
    scanf("%d",&end->m_Num);
    end->next=NULL;
    (head->m_Num)++;
    printf("成功添加节点");
    return end;
}
void scanList(List*head)
{
    if(head->m_Num==0)
        printf("当前链表没有节点");
    else
    {
        List*tmp=head->next;
        printf("当前共有%d个节点\n",head->m_Num);
        while(tmp!=NULL)
        {
            printf("%d\n",tmp->m_Num);
            tmp=tmp->next;
        }
    }
}
int main()
{
    List*head=(List*)malloc(sizeof(List));
    head->next=NULL;
    List*end=head;
    head->m_Num=0;
    int choose=0;
    while(1)
    {
        showMenu();
        scanf("%d",&choose);
        switch(choose)
        {
        case 1:
        {
            end=addList(end,head);
            system("pause");
            system("cls");
        }
        break;
        case 2:
        {
            scanList(head);
            system("pause");
            system("cls");
        }
        break;
        case 3:
            break;
        default:
            break;
        }
    }
    return 0;
}

看了好一会儿才看出你的问题
你的代码们有主要问题是这里，每一次重新插入后，其实要让end执向最后得节点得，但是，其实函数传参是拷贝传参，按地址传参得，你要用传参得方式使每次对外循环时得end生效，这里要点技巧得。。。

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct LinkList
{
    int m_Num;
    struct LinkList* next;
}List;
void showMenu()
{
    printf("**************\n");
    printf("**1.添加节点**\n");
    printf("**2.遍历链表**\n");
    printf("**3.查找节点**\n");
    printf("**4.删除节点**\n");
    printf("**5.插入节点**\n");
    printf("**************\n");
}
void addList(List** end, List* head)
{
    List *temp = (List*)malloc(sizeof(List));
    if (temp == NULL) return;
    temp->m_Num = 0;
    temp->next = NULL;
    //end->next = (List*)malloc(sizeof(List));
    //end = end->next;
    //if (end == NULL) return;
    printf("请输入该节点编号：");
    scanf_s("%d", &temp->m_Num);
    //scanf_s("%d", &end->m_Num);
    (*end)->next = temp;
    (*end) = temp;
    //end->next = NULL;
    (head->m_Num)++;
    printf("成功添加节点 \n");
}
void scanList(List* head)
{
    if (head->m_Num == 0) 
        printf("当前链表没有节点");
    else
    {
        List* tmp = head;
        printf("当前共有%d个节点\n", head->m_Num);
        while (tmp != NULL)
        {
            printf("%d\n", tmp->m_Num);
            tmp = tmp->next;
        }
    }
}
int main()
{
    List* head = (List*)malloc(sizeof(List));
    if (head == NULL) return 1;
    head->next = NULL;
    List* end = head;
    head->m_Num = 0;
    int choose = 0;
    while (1)
    {
        showMenu();
        scanf_s("%d", &choose);
        switch (choose)
        {
        case 1:
        {
            addList(&end, head);
            system("pause");
            //system("cls");
        }
        break;
        case 2:
        {
            scanList(head);
            system("pause");
            //system("cls");
        }
        break;
        case 3:
            break;
        default:
            break;
        }
    }
    return 0;
}

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