用C写了一个带头尾指针的单向链表,仅在尾部进行插入操作,在任意位置进行删除操作。因为只用到这么些功能,又因为懒,所以没有扩展。因为插入是固定在尾部进行,带一个尾指针的好处是显而易见的。当然删除时要付出一些开销。
list.h
-------------------------------------------
/* list.h
** Copyright 2004 Coon Xu.
** Author: Coon Xu
** Date: 06 Sep 2004
*/
#ifndef LIST_H
#define LIST_H
#include <stdio.h>
#include <stdlib.h>
struct listnode
{
struct listnode* next;
int data;
};
struct list
{
struct listnode* head;
struct listnode* tail;
int count;
};
void list_init(struct list*);
void list_insert(struct list*, struct listnode*);
int list_delete(struct list*, struct listnode*);
#endif
------------------------------------------
list.c
------------------------------------------
/* list.c
** Copyright 2004 Coon Xu.
** Author: Coon Xu
** Date: 06 Sep 2004
*/
#include "list.h"
void list_init(struct list* myroot)
{
myroot->count = 0;
myroot->head = NULL;
myroot->tail = NULL;
}
void list_insert(struct list* myroot, struct listnode* mylistnode)
{
myroot->count++;
mylistnode->next = NULL;
if(myroot->head == NULL)
{
myroot->head = mylistnode;
myroot->tail = mylistnode;
}
else
{
myroot->tail->next = mylistnode;
myroot->tail = mylistnode;
}
}
int list_delete(struct list* myroot, struct listnode* mylistnode)
{
struct listnode* p_listnode = myroot->head;
struct listnode* pre_listnode;
//myroot is empty
if(p_listnode == NULL)
{
return 0;
}
if(p_listnode == mylistnode)
{
myroot->count--;
//myroot has only one node
if(myroot->tail == mylistnode)
{
myroot->head = NULL;
myroot->tail = NULL;
}
else
{
myroot->head = p_listnode->next;
}
return 1;
}
while(p_listnode != mylistnode && p_listnode->next != NULL)
{
pre_listnode = p_listnode;
p_listnode = p_listnode->next;
}
if(p_listnode == mylistnode)
{
pre_listnode->next = p_listnode->next;
myroot->count--;
return 1;
}
else
{
return 0;
}
}
-------------------------------------------
main.c
-------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include "list.h"
int main(int argc, char *argv[])
{
struct list l;
list_init(&l);
int ix = 0;
for(ix = 0; ix < 10; ix++)
{
struct listnode* p_node = malloc(sizeof(struct listnode));
p_node->data = ix;
list_insert(&l, p_node);
}
struct listnode* p_listnode = l.head;
while(p_listnode != NULL)
{
printf("%d/n", p_listnode->data);
p_listnode = p_listnode->next;
}
int input;
printf("input the number you want delete:/n");
scanf("%d", &input);
while(input > 0)
{
p_listnode = l.head;
while(p_listnode->next != NULL && p_listnode->data != input)
{
p_listnode = p_listnode->next;
}
if(p_listnode->data == input)
{
printf("Delete success!!/nprint the list!!/n");
list_delete(&l, p_listnode);
free(p_listnode);
p_listnode = l.head;
while(p_listnode != NULL)
{
printf("%d/n", p_listnode->data);
p_listnode = p_listnode->next;
}
}
else
{
printf("not find %d/n", input);
}
scanf("%d", &input);
}
system("PAUSE");
return 0;
}
============================================================================
抄了一遍,还是要多动手啊。
============================================================================
#include "list.h"
#define debug(fmt, arg...) printf("%d@%s"fmt"/n",__LINE__,__FUNCTION__,##arg);
void list_insert(struct list *myroot, struct listnode *plistnode)
{
struct listnode *ph = myroot->head;
struct listnode *pt = myroot->tail;
struct listnode *ptp = myroot->head;
if(ph == pt)
{
debug();
ph->next = plistnode;
pt = plistnode;
myroot->tail = pt;
myroot->count ++;
pt->next = NULL;
}
else
{
debug();
pt->next = plistnode;
pt = pt->next;
myroot->tail = pt;
myroot->count ++;
pt->next = NULL;
}
}
void list_init(struct list *myroot)
{
myroot->count = 0;
myroot->head = myroot;
myroot->tail = myroot;
}
int list_delete(struct list *myroot, struct listnode *plistnode)
{
struct listnode *pre = myroot->head;
struct listnode *pc = myroot->head;
printf("/ncurrent count is %d/n",myroot->count);
if(plistnode == NULL)
printf("/nwrong node type/n");
if(myroot->head == myroot->tail)
printf("/n the list has all deleted yet/n");
while(pc != plistnode && pc->next != NULL)
{
debug();
pre = pc;
pc = pc->next;
}
if(pc->next == NULL && plistnode != pc)
{
printf("/nnode doesn't exsit/n");
return -1;
}
else
{
debug();
printf("/nnode deleted success/n");
pre->next = pc->next;
myroot->count --;
free(plistnode);
}
return 0;
}
本文介绍了一种使用C语言实现的单向链表,该链表包含头尾指针,支持在尾部插入元素及任意位置删除元素。文章提供了完整的源代码,并通过实例演示了如何使用该链表。
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