#include<stdio.h>
#include<stdlib.h>

#define LEN sizeof(struct xuesheng);

struct xuesheng
{
    long xuehao;
    float chengji;
    struct xuesheng *next;
};

int main(void)
{
    struct xuesheng *p1,*p2,*head;
    int n;
    head=NULL;
    p1=p2=(struct xuesheng *)malloc(LEN);
    scanf("%ld %f",p1->xuehao,p2->chengji);
    while(p1->xuehao!=0)
    {
        ++n;
        if(n==1) head=p1;
        else p2->next=p1;
        p2=p1;
        p1=(struct xuesheng *)malloc(LEN);
        scanf("%ld %f",p1->xuehao,p1->chengji);
    }
    p2->next=NULL;
    return 0;
}

是什么错误， 是编译还是运行， 还是逻辑错误，

不能运行，应该是编译错误，错误提示信息是：错误 noname.c 18: 函数调用缺少 ')'在 main 函数中

#include<stdio.h>
#include<stdlib.h>

#define LEN sizeof(struct xuesheng);//这里多了一个分号

struct xuesheng
{
    long xuehao;
    float chengji;
    struct xuesheng *next;
};

int main(void)
{
    struct xuesheng *p1,*p2,*head;
    int n;
    head=NULL;
    p1=p2=(struct xuesheng *)malloc(LEN);
    scanf("%ld %f",p1->xuehao,p2->chengji);
    while(p1->xuehao!=0)
    {
        ++n;
        if(n==1) head=p1;
        else p2->next=p1;
        p2=p1;
        p1=(struct xuesheng *)malloc(LEN);
        scanf("%ld %f",p1->xuehao,p1->chengji);
    }
    p2->next=NULL;
    return 0;
}

#include<stdio.h>
#include<stdlib.h>

#define LEN sizeof(struct xuesheng);  //这里多了一个分号,如楼上所说.

struct xuesheng
{
    long xuehao;
    float chengji;
    struct xuesheng *next;
};

int main(void)
{
    struct xuesheng *p1,*p2,*head;
    int n;                                   //此处n给个初值...
    head=NULL;
    p1=p2=(struct xuesheng *)malloc(LEN);
    scanf("%ld %f",p1->xuehao,p2->chengji);//后面的p2改为p1,并且两个加上&符
    while(p1->xuehao!=0)
    {
        ++n;
        if(n==1) head=p1;
        else p2->next=p1;
        p2=p1;
        p1=(struct xuesheng *)malloc(LEN);
        scanf("%ld %f",p1->xuehao,p1->chengji);  //这里也要两个&符
    }
    p2->next=NULL;
    return 0;
}

多谢前辈！

多谢前辈！