程序代码：

#include<stdio.h>
#include<malloc.h>
#include<conio.h>
#define len sozeof(struct student);
#define null 0;

struct student                           //声明
{long num;
int score;
student *next;
};

int n;

struct student *creat()                       //创建单链表
{struct student *head;
struct student *p1,*p2;
n=0;
p1=p2=(struct student*)malloc(len);     //这里报错：“student”的前面应有“)”  “sozeof”: 找不到标识符
scanf("%ld,%d",&p1->num,&p1->score);
head=null;
     while(p1->num!=0)
     {n=n+1;
         if(n==1)      head=p1;
         else          p2->next;
     p2=p1;
     p1=(struct student *)malloc(len);
     scanf("%ld%d\n",&p1->score);
     }

 p2->next=null;

 return(head);
}

最好有关于malloc函数使用方法和范本，谢谢