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C 动态链表的建立，输出，删除，插入
动态链表的建立，输出，删除，插入
#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
#define NULL 0
#define LEN sizeof(struct student)
struct student
{
long num;
float score;
struct student*next;
};
int n;/*n为全局变量*/
struct student *creat()
{
struct student*p1,*p2,*head;
n=0;
p1=p2=(structstudent *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->score);
head=NULL;
while(p1->num!=0)
{
n=n+1;
if(n==1)
head=p1;
elsep2->next=p1;
p2=p1;
p1=(structstudent *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->score);
}
p2->next=NULL;
return (head);
}
void print(struct student *head)
{
struct student*p;
printf("\nThese records are:\n");
p=head;
if(head!=NULL)
do
{
printf("%ld,%f\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");goto end;}
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("%d not beenfound!\n",num);
end:;
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) //和上面的if矛盾，不对
{
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 main()
{
struct student*head ,stu;
long del_num;
printf("inputrecords:\n");
head=creat();
print(head);
printf("\ninputthe deleted number:");
scanf("%ld",&del_num);
head=del(head,del_num);
print(head);
printf("\ninputthe inserted record:");
scanf("%d,%f",&stu.num,&stu.score);
head=insert(head,&stu);
print(head);
}