#include<stdio.h>
#include "malloc.h"
#define NULL 0
#define LEN sizeof(struct student)
struct student
    {
        long num;  
        float score;
        struct student*next;
    };
int n;
struct student *create()
    {
        struct student*head;
        struct student*p1,*p2;  
        n=0;   
        p1=p2=(struct student *) malloc (LEN);
        scanf("%ld,%f",&p1->num,&p1->score);
        head=NULL;
        while(p1->num!=0)
            {   
                n=n+1;
                if(n==1) head=p1;
                else p1=p2->next;
                p2=p1;
                p1=(struct student*) malloc(LEN);
                scanf("%ld,%f",&p1->num,&p1->score);
            }
        p2->next=NULL;
        return(head);
    }
void print(struct student head)
{struct student* p;
    p=head;
    if(head!=NULL)
    do
    {
        printf("num=%ld   score=%5.1f\n", p->num, p->score);
        p = p->next;
    } while (p!=NULL);   
}
int main()
{    struct student*head;
    head=create();
    print(head);
    return 0;
}
编译问题：
1. error C2679: binary '=' : no operator defined which takes a right-hand operand of type 'struct student' (or there is no acceptable conversion)
2.error C2676: binary '!=' : 'struct student' does not define this operator or a conversion to a type acceptable to the predefined operator
3.error C2664: 'print' : cannot convert parameter 1 from 'struct student *' to 'struct student'
        No constructor could take the source type, or constructor overload resolution was ambiguous
Error executing cl.exe.

void print(struct student * head)
//#define NULL 0

谢谢 大佬！！！！