#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct stu{
    int num;
    char name[20];
    struct stu * next;
};
struct stu * creat();
struct stu * show(struct stu * head);
int main(void)
{
    int choice;
    struct stu * head = NULL;

    printf("1:creat link\n");
    printf("2:show link\n");
    printf("0:exit\n");
    printf("enter 0-2 !\n");
    scanf("%d",&choice);
    switch(choice){
    case 1:
        head = creat();
    case 2:
        show(head); break;
    case 0:
        break;
    }
    printf("input error!");

    return 0;
}
struct stu * creat()
{
    struct stu * head,* p,* tail;

    int num;
    char name[20];
    head = tail = NULL;

    int size = sizeof(struct stu);

    printf("input 0 exit!\n");
    printf("inout num and name:\n");
    scanf("%d%s",&num,name);
    do{
        p = (struct stu *)malloc(size);
        p->num = num;
        strcpy(p->name,name);
        if(head == NULL)
            head = p;
        else
            tail->next = p;
        tail = p;
        scanf("%d",&num);
        scanf("%s",name);
    }while(num != 0);

    return head;
}
struct stu * show(struct stu * head)
{
    struct stu * ptr;
   
    printf("输出链表：");
    if(head == NULL){
        printf("NULL!\n");
        return 0;
    }
    for(ptr = head;ptr;ptr = ptr->next)
        printf("%d   %s\n",ptr->num,ptr->name);
    return 0;
}

[local]1[/local]

帮忙a

主要问题是链表没有尾巴,下面代码修改了一下,供您参考下:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct stu{
    int num;
    char name[20];
    struct stu * next;
};
struct stu * creat();
struct stu * show(struct stu * head);
int main(void)
{
    int choice;
    struct stu * head = NULL;

    printf("1:creat link\n");
    printf("2:show link\n");
    printf("0:exit\n");
    printf("enter 0-2 !\n");
    scanf("%d",&choice);
    switch(choice){
    case 1:
        head = creat();
    case 2:
        show(head); break;
    case 0:
        break;
    default:
        printf("input error!");
    }

    return 0;
}
struct stu * creat()
{
    struct stu * head,* p,* tail;

    int num;
    char name[20];
    head = tail = NULL;

    int size = sizeof(struct stu);

    printf("input 0 exit!\n");
    printf("inout num and name:\n");
    scanf("%d %s",&num,name);
    do{
        p = (struct stu *)malloc(size);
        p->num = num;
        strcpy(p->name,name);
        if(head == NULL)
            head = p;
        else
            tail->next = p;
        tail = p;
        p->next=NULL;
        scanf("%d",&num);
        scanf("%s",name);
    }while(num != 0);

    return head;
}
struct stu * show(struct stu * head)
{
    struct stu * ptr;

    printf("输出链表：\n");
    if(head == NULL){
        printf("NULL!\n");
        return 0;
    }
    for(ptr = head;ptr;ptr = ptr->next)
        printf("%d   %s\n",ptr->num,ptr->name);
    return 0;
}

新手来学习，希望多多帮助

虽然有点晚了，但还是谢谢