c语言链表查找成绩不及格,单链表 为什么输入成绩 按Enter无法正确输出

单链表 为什么输入成绩 按Enter无法正确输出

/* Note:Your choice is C IDE */

#include"stdio.h"

#include"malloc.h"

#define LEN sizeof(struct student)

struct student

{

long num;

float score;

struct student*next;

};

int n;

int main()

{

struct student*creat();

struct student*del(struct student*,long);

struct student*insert(struct student*,struct student*);

void print(struct student*);

struct student*head,stu;

long del_num;

printf("input records:n");

head=creat();

print(head);

printf("input the deleted number:");

scanf("%1d",&del_num);

head=del(head,del_num);

print(head);

printf("input the inserted record:");

scanf("%1d,%f",&stu.num,&stu.score);

head=insert(head,&stu);

print(head);

return 0;

}

struct student*creat()

{

struct student*head;

struct student*p1,*p2;

n=0;

p1=p2=(struct student*)malloc(LEN);

scanf("%1d,%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("%1d,%f",&p1->num,&p1->score);

}

p2->next=NULL;

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:%1dn",num);

n=n-1;

}

else printf("%1d not been found!n",num);

return (head);

}

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);

}

}

void print(struct student*head)

{

struct student*p;

printf("n Now,These %d records are:",n);

p=head;

if(head!=NULL)

do

{printf("%1d,%5.1f",p->num,p->score);

p=p->next;

}while(p!=NULL);

}