#include
#include
#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=NULL;
struct student *p2=NULL;
n=0;
p2=p1=(struct student*)malloc(LEN);
if(p1==NULL)
{
printf("\ncann't creat it.\n");
return NULL;
}
else
{
head=NULL;
}
scanf("%ld,%f",&p1->num,&p1->score );
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;
free(p1);
p1=NULL;
return (head);
}
return 0;}
void print(struct student *head)
{
struct student *p;
printf("\nNow there %d records are:",n);
p=head;
if(head!=NULL)
do
{
printf("%ld,%5.1f",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 is null.\n");
return 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;
free(p1);
p1=NULL;
printf("delete :%ld\n",num);
n=n-1;
}
else
{
printf("can't find %ld\n",num);
return head;
}
return 0;}
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 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;
}
return 0;}
void main()
{
struct student *head ,*stu;
long del_num;
printf("input records:\n");
head=creat();
print(head);
printf("\ninput the delede number:\n");
scanf("%ld",&del_num);
while(del_num!=0)
{
head=del(head,del_num);
print(head);
printf("input the delede number:");
scanf("%ld",&del_num);
}
printf("\ninput the inserted record:");
stu=(struct student*)malloc(LEN);
scanf("%ld,%f",&stu->num ,&stu->score );
while(stu->num!=0);
{
head=insert(head,stu);
print(head);
printf("\ninput the inserted record:");
stu=(struct student*)malloc(LEN);
scanf("%ld,%f",&stu->num ,&stu->score );
}
}
|
