单项链表逆序

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程序1：

//
//  main.cpp
//  testC++06ReverseSingleLinkedList
//
//  Created by fei dou on 12-8-9.
//  Copyright (c) 2012年 vrlab. All rights reserved.
//

#include <iostream>
using namespace std;

typedef struct node{
    char data;
    node * next;
}Node;

/*从头插入链表*/
inline void insertIntoListFromHead(char data, Node* (&head))
{
    Node *newNode = new Node();
    newNode -> data = data;
    newNode -> next = head;
    head = newNode;
}

/*翻转链表*/
Node * reverseSingleLinkedList(Node *head);
void printList(Node *head);

void printList(Node *head)
{
    while(head)
    {
        cout << head -> data << "   ";
        head = head -> next;
    }
}


/*完成单项链表的逆序操作*/
Node * reverseSingleLinkedList(Node *head)
{
    Node *newHead = NULL;
    while (head)
    {
        Node *headNext = head -> next;          //保存head下一个节点
        head -> next = newHead;                 //从头插入新的反向链表中
        newHead = head;                         //从头插入新的反向链表中
        head = headNext;                        //head重新指向还没有反向的链表的头部
    }
    return newHead;
}


int main (int argc, const char * argv[])
{

    Node *listHead = NULL;
    for (char ch = 'f'; ch >= 'a'; --ch)
        insertIntoListFromHead(ch, listHead);
    cout << "原始列表内容是：" <<endl;
    printList(listHead);
    listHead = reverseSingleLinkedList(listHead);
    cout << endl << "逆序后的结果是：" << endl;
    printList(listHead);
    cout << endl;
    /*释放空间*/
    while (listHead)
    {
        Node *delNode = listHead;
        listHead = listHead -> next;
        delete  delNode;
        delNode = NULL;
    }
    return 0;
}

程序2：

//
//  main.cpp
//  testC++06ReverseSingleLinkedList
//
//  Created by fei dou on 12-8-9.
//  Copyright (c) 2012年 vrlab. All rights reserved.
//

#include <iostream>
using namespace std;

typedef struct node{
    char data;
    node * next;
}Node;

/*从头插入链表*/
inline void insertIntoListFromHead(char data, Node* (&head))
{
    Node *newNode = new Node();
    newNode -> data = data;
    newNode -> next = head;
    head = newNode;
}

/*从头插入链表*/
inline void insertIntoListFromHead(Node *insertNode, Node* (&head))
{
    if (!insertNode) return;
    insertNode -> next = head;
    head = insertNode;
}

/*翻转链表*/
Node * reverseSingleLinkedList(Node *head);
void printList(Node *head);

void printList(Node *head)
{
    while(head)
    {
        cout << head -> data << "   ";
        head = head -> next;
    }
}


/*完成单项链表的逆序操作*/
Node * reverseSingleLinkedList(Node *head)
{
    Node *newHead = NULL;
    while (head)
    {
        Node *headNext = head -> next;          //保存head下一个节点
        insertIntoListFromHead(head, newHead);  //从头插入到逆序链表中
        head = headNext;                        //head重新指向还没有反向的链表的头部
    }
    return newHead;
}


int main (int argc, const char * argv[])
{
    
    Node *listHead = NULL;
    for (char ch = 'f'; ch >= 'a'; --ch)
        insertIntoListFromHead(ch, listHead);
    cout << "原始列表内容是：" <<endl;
    printList(listHead);
    listHead = reverseSingleLinkedList(listHead);
    cout << endl << "逆序后的结果是：" << endl;
    printList(listHead);
    cout << endl;
    /*释放空间*/
    while (listHead)
    {
        Node *delNode = listHead;
        listHead = listHead -> next;
        delete  delNode;
        delNode = NULL;
    }
    return 0;
}

程序3：

//
//  main.cpp
//  testC++06ReverseSingleLinkedList
//
//  Created by fei dou on 12-8-9.
//  Copyright (c) 2012年 vrlab. All rights reserved.
//

#include <iostream>
using namespace std;

typedef struct node{
    char data;
    node * next;
}Node;

/*从头插入链表*/
inline void insertIntoListFromHead(char data, Node* (&head))
{
    Node *newNode = new Node();
    newNode -> data = data;
    newNode -> next = head;
    head = newNode;
}

/*从头插入链表*/
inline void insertIntoListFromHead(Node *insertNode, Node* (&head))
{
    if (!insertNode) return;
    insertNode -> next = head;
    head = insertNode;
}

/*翻转链表*/
Node * reverseSingleLinkedList(Node *head);
void printList(Node *head);

void printList(Node *head)
{
    while(head)
    {
        cout << head -> data << "   ";
        head = head -> next;
    }
}


/*完成单项链表的逆序操作*/
Node * reverseSingleLinkedList(Node *head)
{
    if (head == NULL || head -> next == NULL) return  head;
    Node * subReversedList = reverseSingleLinkedList(head -> next);
    head -> next -> next = head;
    head -> next = NULL;
    return subReversedList;
}



int main (int argc, const char * argv[])
{
    
    Node *listHead = NULL;
    for (char ch = 'f'; ch >= 'a'; --ch)
        insertIntoListFromHead(ch, listHead);
    cout << "原始列表内容是：" <<endl;
    printList(listHead);
    listHead = reverseSingleLinkedList(listHead);
    cout << endl << "逆序后的结果是：" << endl;
    printList(listHead);
    cout << endl;
    /*释放空间*/
    while (listHead)
    {
        Node *delNode = listHead;
        listHead = listHead -> next;
        delete  delNode;
        delNode = NULL;
    }
    return 0;
}

上面三个程序相信都能读懂，这里不在进行解释