链表list.cpp和list.h

list.h

//list.h
struct ListNode
{
    int       m_nValue;
    ListNode* m_pNext;
};

ListNode* CreateListNode(int value);
void ConnectListNodes(ListNode* pCurrent, ListNode* pNext);
void PrintListNode(ListNode* pNode);
void PrintList(ListNode* pHead);
void DestroyList(ListNode* pHead);
void AddToTail(ListNode** pHead, int value);
void RemoveNode(ListNode** pHead, int value);

list.cpp

//创建一个结点
ListNode* CreateListNode(int value)
{
    ListNode* Node = new ListNode();
    pNode->m_nValue = value;
    pNode->m_pNext = NULL;

    return pNode;
}

//连接两个结点
void ConnectListNode(ListNode* pCurrent, ListNode* pNext)
{
    if(pCurrent == NULL)
    {
        printf("Error to connect two nodes\n");
        exit(1);
    }
    pCurrent->m_pNext = pNext;
}

//打印结点值
void PrintListNode(ListNode* pNode)
{
    if(pNode == NULL)
    {
        printf("The Node is NULL\n");
    }
    else
    {
        printf("The Key in node is %d.\n", pNode->m_nValue);
    }
}

//打印链表
void PrintList(ListNode* pHead)
{
    printf("\nPrintList starts.\n");

    ListNode* pNode = *pHead;
    while(pNode != NULL)
    {
        printf("%d\t", pNode->m_nValue);
        pNode = pNode->m_pNext;
    }

    printf("\nPrintList ends.\n");
}

//删除链表
void DestroyList(ListNode* pHead)
{
    ListNode* pNode = pHead;
    while(pNode != NULL)
    {
        pHead = pHead->m_pNext
        delete pNode;
        pNode = pHead;
    }
}

//单向链表末尾添加一个结点
void AddToTail(ListNode** pHead, int value)
{
    ListNode* pNew = new ListNode();
    pNew->m_nValue = value;
    pNew->m_pNext = NULL;

    //若是空链表
    if(*pHead == NULL)
        *pHead = pNew;
    else
    {
        ListNode* pNode = *pHead;

        //找到最后一个结点,此时pNode指向尾结点
        while(pNode->m_pNext != NULL)
            pNode = pNode->m_pNext;

        pNode->m_pNext = pNew;
    }
}


//在链表中找到第一个含有某值的结点并删除该结点
void RemoveNode(ListNode** pHead, int value)
{
    //空链表
    if(pHead == NULL || *pHead == NULL)
        return;

    ListNode* pToBeDeleted = NULL;
    //如果要删除的结点为首结点
    if((*pHead)->value == value)
    {
        pToBeDeleted = *pHead;
        *pHead = (*pHead)->m_pNext;
    }
    else
    {
        ListNode* pNode = *pHead;
        //退出while循环的条件是（1）到达尾结点 
        //（2) 找到与value匹配的结点
        //pNode指向将被删结点的前一个结点
        while(pNode->m_pNext != NULL && pNode->m_pNext->m_nValue != value)
            pNode = pNode->m_pNext;

        //注意if条件内容
        if(pNode->m_pNext != NULL && pNode->m_pNext->m_nValue == value)
        {
            pToBeDeleted = pNode->m_pNext;
            pNode->m_pNext = pNode->m_pNext->m_pNext;
        }

        //确定存在与valude值匹配的将要删除的结点
        if(pToBeDeleted!= NULL)
        {
            delete pToBeDeleted;
            pToBeDeleted = NULL;
        }
    }
}