#include<stdio.h>
#include<stdlib.h>
typedef struct Student
{
    int No;
    int num;
    float score;
    struct Student *pnext;
}NODE,*PNODE;
PNODE creat(void);
void print(PNODE head);
void del(PNODE head);
void insert(PNODE head);
int main(void)
{
    PNODE head;
    head=creat();
    return 0;
}
PNODE creat(void)
{
    int i=0;
    PNODE head,p,pnew;
    head=(PNODE)malloc(sizeof(NODE));
    if(head==NULL)
    {
        printf("动态内存分配失败！\n");
        exit(-1);
    }
    head->pnext=NULL;
    p=head;
    do
    {
        pnew=(PNODE)malloc(sizeof(NODE));
        i++;
        if(pnew==NULL)
        {
            printf("动态内存分配失败！\n");
            exit(-1);
        }
        printf("请输入学号及成绩：");
        scanf("%d %f",&pnew->num,&pnew->score);
        pnew->No=i;
        if(pnew->num==0)//当学号为0时退出循环
        {
            p->pnext=NULL;
            free(pnew);
        }
        else
        {
            p->pnext=pnew;
            p=pnew;
        }
    }while(p->pnext!=NULL);
    return head;
}

[此贴子已经被作者于2016-12-7 22:26编辑过]

我试的没出错

我更新了一下，你再帮我试一下，我这次贴了个图

#include<stdio.h>
#include<stdlib.h>
typedef struct Student
{
    int No;
    int num;
    float score;
    struct Student *pnext;
}NODE,*PNODE;
PNODE creat(void);
void print(PNODE head);
void del(PNODE head);
void insert(PNODE head);
int main(void)
{
    PNODE head;
    head=creat();
    return 0;
}
PNODE creat(void)
{
    int i=0;
    int num;
    float score;
    PNODE head,p,pnew;
    head=(PNODE)malloc(sizeof(NODE));
    if(head==NULL)
    {
        printf("动态内存分配失败！\n");
        exit(-1);
    }
    head->pnext=NULL;
    p=head;
    do
    {
        pnew=(PNODE)malloc(sizeof(NODE));
        i++;
        if(pnew==NULL)
        {
            printf("动态内存分配失败！\n");
            exit(-1);
        }
        printf("请输入学号及成绩：");
        scanf("%d %f",&pnew->num,&pnew->score);//把这个地方改成：scanf("%d %f",&num,&score);pnew->num=num;pnew->score=score;就可以正常运行了，你们知道是怎么回事不？
        pnew->No=i;
        if(pnew->num==0)//当学号为0时退出循环
        {
            p->pnext=NULL;
            free(pnew);
        }
        else
        {
            p->pnext=pnew;
            p=pnew;
        }
    }while(p->pnext!=NULL);
    return head;
}

[此贴子已经被作者于2016-12-7 22:33编辑过]