请大家看看这个程序能求两个长整数相加么
#include "stdio.h"
#include "malloc.h"
#define NULL 0
#define LEN sizeof(struct add)

struct add
{
    long num1;
    long num2;
    long result;
    result=num1+num2;
    struct *next;
};
int n;
struct add *creat(void)
{
    struct add *head;
    struct add *p1,*p2；
    n=0;
    p1=p2(struct add *)malloc(LEN);
    scanf("%ld,%ld",&p1->num1,&p1->num2);
    head=NULL;
    while(p1->num1!=0&&p2->num2!=0)
    {
        n=n+1;
        if(n==1)
            head=p1;
        else p2->next=p;
        p2=p1;
        p1=(struct student *)malloc(LEN);
        scanf("%ld,%ld",&p1->num1,&p1->num2);}
    }
p2->next=null;
return(head);
}
void print(struct add *head)
{
    struct add *p;
    p=head;
    if(head!=NULL)
        do
        {
            printf("%ld",p->result);
            p=p->next;
        }while(p!=NULL);
}
int main(int argc, char* argv[])
{
    printf("请输入相加的两个数：");
    creat();
    print(struct add *head);

    return 0;
}

result=num1+num2;
能在结构中这样写吗?难道不是C?
struct *next;//这里又是什么意思,应该是add * next;才对吧
p1=p2(struct add *)malloc(LEN);//这个......p1=p2=(struct add *)malloc(LEN); ???
但这样的话后面的逻辑就完全错误了.而且,LEN从哪儿来的?
else p2->next=p;//p从哪儿来的????
......
太多的基本错误,基础啊.