链表的C/C++实现

一个链表实现,函数声明放在 list.h 头文件汇总，函数定义放在list.cpp 中，main.cpp 用来测试各个函数.

1.文件list.h

// list.h

#ifndef  __LIST_H_
#define  __LIST_H_

typedef char EleType;	//定义链表存储的数据类型 

//链表节点结构
typedef struct node
{
	EleType data;
	struct node * next;
}ChainNode;

//头结点
typedef struct {
	ChainNode* head;
} List;


List* CreateList();		//创建链表
void DestoryLIst(List* );		//删除链表
void ClearList(List* );
int ListAppend(List*, EleType);		//追加元素
int ListInsert(List*, int, EleType);	//插入元素
int ListDelete(List*, int);		//删除元素
int GetElememt(List*, int, EleType *);	//取元素
ChainNode* GetAddr(List*,int );		//取元素地址
ChainNode* NewChainNode(EleType);	//创建一个元素节点
int TraverseList(List*, int(*) (EleType*) );	//遍历元素
void ShowList(List*);
int PrintElement(EleType *);
#endif

1. 文件list.cpp

// list.cpp

#include "list.h"
//#include<stdio.h>
#include <iostream>
using namespace std;

//创建链表,仅有头结点
List* CreateList()
{
	List* p = new List;
	EleType data = (EleType)0;
	p->head = NewChainNode(data);
	if(NULL != p && NULL !=p->head) 
	{
		p->head->data = data;
		p->head->next = NULL;
		return p;
	}
	cout<<"分配内存失败"<<endl;
	return NULL;
}
	

//删除链表
void DestoryLIst(List* lp)
{
	if(NULL != lp)
	{
		ClearList(lp);
		delete lp;
	}
}	

//清空链表
void ClearList(List* lp)
{
	if(NULL != lp)
	{
		while(ListDelete(lp, 1) );
	}
	
}

//追加元素
int ListAppend(List* lp, EleType ele)
{
	ChainNode* p=NULL;
	ChainNode* newp= NewChainNode(ele);
	if(NULL != lp && NULL != newp)
	{
		for(p=lp->head; p->next; p=p->next);
		p->next = newp;	
		return 1;
	}
	return 0;
}	

//插入元素
int ListInsert(List* lp, int n, EleType ele)
{
	ChainNode* p=NULL;
	ChainNode* newp= NewChainNode(ele);

	if(NULL != lp && NULL != newp)
	{
		p = GetAddr(lp, n-1);
		newp->next = p->next;
		p->next = newp;
		return 1;
	}
	return 0;
}	

//删除元素
int ListDelete(List* lp, int n)
{
	ChainNode* temp = NULL;
	if(NULL != lp && NULL != lp->head->next)
	{
		temp = GetAddr(lp, n-1);
		if(NULL != temp && NULL != temp->next)
		{
			temp->next = temp->next->next;
			return 1;
		}
	}
	return 0;
}

//取元素
int GetElememt(List* lp, int n, EleType * ele)
{
	ChainNode* p = NULL;
	if(NULL != lp && NULL != lp->head->next)
	{
		p =GetAddr(lp, n-1);
		if(NULL != p)
		{
			*ele = p->data;
			return 1;
		}
	}
	return 0;
}

//取元素地址
ChainNode* GetAddr(List* lp,int n )
{
	if(n >= 0)
	{
		ChainNode* p = lp->head;
		if(NULL != lp && NULL != p->next)
		{
			int i = 0;
			while(NULL !=p && i<n)
			{
				p = p->next;
				i++;
			}
			return p;
		}
	}
	cout<<"n应该为非负数"<<endl;
	return NULL;
}

//创建一个元素节点
ChainNode* NewChainNode(EleType ele)
{
	ChainNode* p =new ChainNode;
	if(p != NULL)
	{
		p->data = ele;
		p->next = NULL;
		
	}
	return p;
}

//遍历元素
int TraverseList(List* lp, int (*f) (EleType *) )	
{	
	if(NULL != lp)
	{
		ChainNode* p = lp->head->next;
		int i =0;
		for( ; NULL != p; p= p->next)
		{
			if( !f(&(p->data)) )
			{
				return i+1;
			}
			i++;
		}
		return 0;

	}

}

void ShowList(List* lp)
{
	TraverseList(lp, PrintElement);
	cout<<endl;
}

int PrintElement(EleType *data)
{
	cout<<" "<<*data;
	return 1;
}

1. 文件main.cpp

// main.cpp

#include "list.h"
#include <iostream>
using namespace std;

int main()
{
	char arr[20] ="hello world";

	List* lp = CreateList();
	if(NULL ==lp ) return 0;
	for(int i = 0; arr[i]; i++)
	{
		ListAppend(lp,arr[i]);
	}
	ShowList(lp);

	ListAppend(lp,'o');
	ListAppend(lp,'v');
	ListAppend(lp,'r');
	ListAppend(lp,'y');
	ShowList(lp);

	ListInsert(lp,1,'a');
	ListInsert(lp,2,'b');
	ShowList(lp);

	ListDelete(lp,1);
	ShowList(lp);
	ListDelete(lp,1);
	ShowList(lp);

	return 0;
}