C++实现链表的进本操作及测试用例
今天实现了下链表的基本操作，包括节点的创建，头插尾插，头删尾删，一次遍历寻找链表的中间节点，寻找链表的倒数第x个节点，删除无头链表的非尾节点，链表的逆置，代码如下：
#include "SLinkList.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
void PrintList(SListNode* pHead)//从指针位置打印链表
{
while (pHead)
{
printf("->%d", pHead->data);
pHead = pHead->next;
}
printf("\n");
}
static SListNode* _BuyNode(DataType x)//创建新的节点
{
SListNode*ret = (SListNode*)malloc(sizeof(SListNode));
ret->next = NULL;
ret->data = x;
if (ret)
{
return ret;
}
printf("创建节点失败\n");//创建失败给出提示
return NULL;
}
void PushBack(SListNode* & pHead, DataType x)//尾插
{
if (pHead == NULL)
{
pHead = _BuyNode(x);
}
else
{
SListNode*tail = pHead;
while (tail->next)
{
tail = tail->next;
}
tail->next = _BuyNode(x);
}
}
void PopBack(SListNode* & pHead)//尾删
{
if (pHead == NULL)
{
return;
}
else if (pHead->next->next == NULL)
{
free(pHead->next);
pHead = NULL;
}
else
{
SListNode* tail = pHead;
while (tail->next->next)
{
tail = tail->next;
}
free(tail->next);
tail->next = NULL;
}
}
void PushFront(SListNode* & pHead, DataType x)//头插
{
if (pHead == NULL)
{
pHead = _BuyNode(x);
}
else
{
SListNode*tmp = _BuyNode(x);
tmp->next = pHead;
pHead = tmp;
}
}
void PopFront(SListNode* & pHead)//t头删
{
if (pHead == NULL)
{
return;
}
else
{
SListNode*tail = pHead;
pHead = pHead->next;
tail->next = NULL;
free(tail);
}
}
SListNode* Find(SListNode *pHead, DataType x)//以x查找节点，若存在返回给节点，若不存在返回空
{
if (pHead == NULL)
{
return NULL;
}
SListNode* tail = pHead;
while (tail)
{
if (tail->data == x)
{
return tail;
}
tail = tail->next;
}
return NULL;
}
void Insert(SListNode* & pos, DataType x)//所给位置后插入一节点
{
SListNode*tmp = _BuyNode(x);
if (pos == NULL)
{
pos = tmp;
}
else
{
tmp->next = pos->next;
pos->next = tmp;
}
}
void Erase(SListNode * &pos)//删除无头链表的非尾节点
{
if (pos == NULL)
{
return;
}
else if (pos->next == NULL)
{
printf("该节点为尾节点，无法删除\n");
}
else
{
SListNode*tmp = pos->next;
pos->data = pos->next->data;
pos->next = pos->next->next;
free(tmp);
tmp = NULL;
}
}
void ReveseList(SListNode * &pHead)//链表的逆置
{
SListNode*tail = pHead;
while (tail->next)
{
SListNode*tmp=NULL;
tmp = tail->next;
tail->next = tail->next->next;
tmp->next = pHead;
pHead = tmp;
}
}
SListNode* FindminList(SListNode*pHead)//一次遍历，寻找链表的中间节点
{
assert(pHead);
SListNode *quick=pHead;
SListNode *slow=pHead;
while (quick)
{
slow = slow->next;
if (quick->next)
quick = quick->next->next;
else
return slow;
}
return slow;
}
SListNode* FindListPosList(SListNode*pHead, int lastpos)//寻找链表的倒数第lastpos个节点
{
SListNode *quick = pHead;
SListNode *slow = pHead;
while (quick&&lastpos--)
{
quick = quick->next;
}
if (quick == NULL)
{
return slow;
}
while (quick)
{
quick = quick->next;
slow = slow->next;
}
return slow;
}
测试用例如下：
#include <stdio.h>
#include <stdlib.h>
#include "SLinkList.h"
void Test1()//PushBack,PrintList,PopBack
{
SListNode*pHead=NULL;
PushBack(pHead, 1);
PushBack(pHead, 2);
PushBack(pHead, 3);
PushBack(pHead, 4);
PushBack(pHead, 5);
PrintList(pHead);
PopBack(pHead);
PopBack(pHead);
PrintList(pHead);
PopBack(pHead);
PopBack(pHead);
PopBack(pHead);
PrintList(pHead);
}
void Test2()//PushFront,Popfront
{
SListNode*pHead = NULL;
PushFront(pHead, 5);
PushFront(pHead, 4);
PushFront(pHead, 3);
PushFront(pHead, 2);
PushFront(pHead, 1);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
PopFront(pHead);
PrintList(pHead);
}
void Test3()//Find,Insert
{
SListNode*pHead = NULL;
PushFront(pHead, 5);
PushFront(pHead, 4);
PushFront(pHead, 3);
PushFront(pHead, 2);
PushFront(pHead, 1);
Insert(pHead, 0);
pHead = Find(pHead, 3);
PrintList(pHead);
Insert(pHead, 4);
PrintList(pHead);
}
void Test4()//Erase
{
SListNode*pHead = NULL;
SListNode*tmp = NULL;
PushFront(pHead, 5);
PushFront(pHead, 4);
PushFront(pHead, 3);
PushFront(pHead, 2);
PushFront(pHead, 1);
tmp = Find(pHead, 5);
Erase(tmp);
PrintList(pHead);
}
void Test5()//ReveseList
{
SListNode*pHead = NULL;
PushBack(pHead, 1);
PushBack(pHead, 2);
PushBack(pHead, 3);
PushBack(pHead, 4);
PushBack(pHead, 5);
ReveseList(pHead);
PrintList(pHead);
}
void Test6()//FindLastposList
{
SListNode*pHead = NULL;
SListNode*ret = NULL;
PushBack(pHead, 1);
PushBack(pHead, 2);
PushBack(pHead, 3);
PushBack(pHead, 4);
PushBack(pHead, 5);
ret=FindListPosList(pHead, 2);
printf("%d\n", ret->data);
ret = FindListPosList(pHead, 6);
printf("%d\n", ret->data);
}
int main()
{
Test1();
Test2();
Test3();
Test4();
Test5();
Test6();
system("pause");
return 0;
}
如有不足希望指正，有疑问希望提出