一个链表的创建，输出，删除，插入！编译时出错了，大哥们，到底哪错了？
#define NULL 0
#define LEN sizeof(struct student)
struct student
{long num;
float score;
struct student*next;
};
int n;
struct student*creat(void)
{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 p2->next=p1;
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;
printf("\nNow,These %d records are:\n",n);
p=head;
if(head!=NULL)
do
{printf("%ld%5.1f\n",p->num,p->score);
p=p->next;
} while(p!=NULL);
}
struct student*insert(struct student*head,struct student*stud)
{struct student *p0,*p1,*p2;
p1=head;
p0=stud;
if(head==NULL)
{head=p0;p0->next=NULL;}
else
{while((p0->num>p1->num)&&(p1->next!=NULL))
{p2=p1;
p1=p1->next;}
if(p0->num<p1->num)
{if(head==p1) head=p0;
else p2->next=p0;
p0->next=p1;}
else
{p1->next=p0;p0->next=NULL;}}
n=n+1;
return(head);
}
struct student*del(struct student*head,long num)
{struct student*p1,*p2;
if(head==NULL){printf("\nlist null!\n");return(head);}
p1=head;
while(num!=p1->num&&p1->next!==NULL)
{p2=p1;p1=p1->next;}
if(num==p1->num)
{if(p1==head)head=p1->next;
else p2->next=p1->next;
printf("delete:%ld\n",num);
n=n-1;
}
else printf("%ld not been found!\n",num);
return(head);
}
main()
{struct student*head,stu;
long del_num;
printf("input records:\n");
head=creat();
print(head);
printf("\ninput the deleted number:");
scanf("%ld",&del_num);
head=del(head,del_num);
print(head);
printf("\ninput the inserted record:");
scanf("%ld,%f",&stu.num,&stu.score);
head=insert(head,&stu);
print(head);
}
提示黑体的这块出错了，到底哪错了啊？
[解决办法]
num!=p1->num&&p1->next!==NULL
！== 这样也行？
