请大神们帮忙解决啊 新人改不了
#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 *creat(void)
{
struct student *p1,*p2;
struct student *head;
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);
}
int count(struct student *head)
{
struct student *p;
n=0;
p=head;
while(p!=NULL)
{
n++;
p=p->next;
}
return(n);
}
struct student *sort(struct student *head)
{
struct student *p;
int i;
if(head!=NULL)
p=head;
for(i=0;i<n;i++)
{
printf("NO.%d:",i+1);
printf("%ld,%5.1f\n",p->num,p->score);
p=p->next;
}
return(head);
}
long len(struct student *head,int r)
{
int i;
struct student *p;
if(head!=NULL)
p=head;
for(i=0;i<r;i++)
{
p++;
}
printf("%ld",p->num);
return(p->num);
}
void print(struct student *head)
{
struct student *p;
printf("\nNow,these records are:\n");
p=head;
if(head!=NULL)
do
{
printf("%ld,%5.1f\n",p->num,p->score);
p=p->next;
}
while(p!=NULL);
}
struct student *del(struct student *head,long num)
{
struct student *p1,*p2;
if(head==NULL)
{
printf("\nlist null!\n");
return NULL;
}
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);
}
struct student *insert(struct student *head,struct student *stud)
{
struct student *p0,*p1;
p1=head;
p0=stud;
if(head==NULL)
{
head=p0;
p0->next=NULL;
}
else
{
while(p1==head)
{
head=p0;
p0->next=p1;
}
n=n+1;
}
return(head);
}
void main()
{
struct student *head,stu;
long del_num;
long num;
int t;
printf("input records:\n");
head=creat();
print(head);
printf("\nthere are %d records.\n",count(head));
printf("the sorted records are:\n");
head=sort(head);
printf("input the NO.:");
scanf("%d",&t);
while(t>n)
{
printf("请从新输入:");
scanf("%d",&t);
}
num=len(head,t);
printf("\ninput the deleted number:");
scanf("%ld",&del_num);
head=del(head,del_num);
print(head);
printf("\ninput the insreted record:");
scanf("%ld,%f",&stu.num,&stu.score);
head=insert(head,&stu);
print(head);
}
