单链表的创建、插入、删除、倒置操作

/*-----------------------------------------------------*/
/*--------------单链表的创建、插入、删除、倒置操作-----------*/
/*--------------Written by redfire250-----2005.5.10----*/
/*-----------------------------------------------------*/

#include<malloc.h>
#include<stdio.h>
#define null 0
struct student
{
long Number;
char Name[20];
long Score;
struct student *Next;
};

int n=0;/*n为全局变量，用来计算链表的结点个数*/

/*-----------------------------------------*/
/*--------------创建结点函数Creat()--------*/
/*-----------------------------------------*/
struct student *Creat()
{

struct student *p1;
struct student *p2;
struct student *head=null;
p1=p2=(struct student *)malloc(sizeof(struct student));/*开辟一段可用内存单元*/
printf("please input the student's Number Name and the Score:/n");
scanf("%ld%s%ld",&p2->Number,p2->Name,&p2->Score);

while(p2->Number!=0)
{
n++;

if(n==1) /*是否开辟的是第一个结点*/
head=p2;
else
p1->Next=p2;

p1=p2;
p2=(struct student *)malloc(sizeof(struct student));
printf("Input the Number the Name and the Score:/n");
scanf("%ld%s%ld",&p2->Number,p2->Name,&p2->Score);
}
p1->Next=null;
return(head);
}

/*------------------------------------------*/
/*--------------查看链表内容函数View()------*/
/*------------------------------------------*/
View(struct student *head)
{
struct student *p;
p=head;
while(p->Next!=null)
{
printf("%ld %s %ld/n",p->Number,p->Name,p->Score);
p=p->Next;
}
printf("%ld %s %ld/n",p->Number,p->Name,p->Score);
}

/*-------------------------------------------------*/
/*--------------插入结点函数（前插）Insert()-------*/
/*-------------------------------------------------*/
Insert(struct student *head,int Num) /*head为链表头指针，Num插入链表位置*/
{
int t=1;
struct student *p1,*p2;
p1=head;
if (Num>n||Num<0)
{
printf("input error!!!/n");
return 0;
}

while(t<Num-1) /*找到要插入结点的前一个结点*/
{
p1=p1->Next;
t++;
}
p2=(struct student *)malloc(sizeof(struct student));
printf("Input the Number the Name and the Score:/n");
scanf("%ld%s%ld",&p2->Number,p2->Name,&p2->Score);
p2->Next=p1->Next;
p1->Next=p2;
n++;

}

/*------------------------------------------*/
/*------------ 删除结点函数Delnode()--------*/
/*-----------------------------------------*/
Delnode(struct student *head,int node)
{
int t=1;
struct student *p1,*p2;
p2=head;
if (node>n||node<1)
{
printf("error!!! The node is not exist!");
return 0;
}
while(t<node-1) /*找到要删除结点的前一个结点*/
{
p2=p2->Next;
t++;
}
p1=p2->Next->Next; /*找到要删除结点的后一个结点*/
free(p2->Next); /*释放要删除的结点空间（删除）*/
p2->Next=p1; /*前一结点指向后一结点*/
n--;
}

/*-------------------------------------------------*/
/*--------------逆序重组链表Invert()-------*/
/*-------------------------------------------------*/
struct student *Invert(struct student *head)
{
struct student *p1,*p2;
p1=head;
p2=p1->Next;
head=p2->Next;
p1->Next=null;
while(head->Next!=null)
{
p2->Next=p1;
p1=p2;
p2=head;
head=head->Next;
}
head->Next=p2;
p2->Next=p1;
return head;
}

main()
{
int number1,number2;
struct student *head;
head=Creat();
View(head);

printf("the n that you want to insert:/n");
scanf("%d",&number1);
Insert(head,number1);
View(head);

printf("the node that you want to DELETE:/n");
scanf("%d",&number2);
Delnode(head,number2);
View(head);

printf("Inverte the list:/n");
View(Invert(head));

getch();
}