#include<stdio.h>
#include<stdlib.h>
struct student
{
    int num;
    char s;
    student *next;
};
student * creat()

{
    student *pnew,*pend;
    student *phead ;   
    phead=NULL;
    do
    {
        pnew=new student;
        printf("please input :\n");
        printf("num:");
        scanf("%d",&pnew->num);
        char ch=getchar();
        if(pnew->num==0) break;
        printf("s:");
        scanf("%c",&pnew->s);
        if(phead==NULL) phead=pnew;
        else pend->next=pnew;
        pend=pnew;
    }while(pnew->num!=0);
   pend->next=0;
    free(pnew);
    return phead;
}
student * save(student *phead)
{
    FILE *fp;
    student *pn;
    pn=phead;
    if((fp=fopen("stud","w"))==NULL)
    {
        printf("cannot open file!\n");
        exit(0);
    }
    do
    {
        fwrite(pn,sizeof(student),1,fp);
        pn=pn->next;
    }while(pn->next!=NULL);
    return phead;
}
void main()
{
    student *head;
   head =creat();
    save(head);
}
在创建中出现了问题，不能正常运行。。。。。