【数据结构】C/C++ 单链表的 创建、初始化、增、删、改、查、遍历等基本操作

#include
#include 
#include 
using namespace std;
typedef int ElemType;
typedef struct pNode{
    ElemType data;
    struct pNode *next;
}LinkList;
//头插法建立单链表
LinkList *Creat_LinkList()
{
    ElemType x;
    LinkList *head,*p;
    head = (LinkList*)malloc(sizeof(LinkList));
    if(head == NULL)
        return head;
    head -> next = NULL;
    cout<<"请输入要录入的数以0结束"<> x;
    while(x != 0)
    {
        p = (LinkList*) malloc(sizeof(LinkList));
        if(p == NULL)
            return head;
        p -> data = x;
        p -> next = head -> next;
        head -> next = p;
        cin >> x;
     }
     return head;
}
//尾插法建立单链表
LinkList * Creat_LinkList_R()
{
    ElemType x;
    LinkList *head,*p,*tail;//tail是尾指针
    head = (LinkList*)malloc(sizeof(LinkList));
    if(head == NULL)
        return head;
    head -> next = NULL;
    tail = head; //一开始尾指针指向头指针的位置
    cout<<"请输入要录入的数以0结束"<> x;
    while(x != 0)
    {
        p = (LinkList*) malloc(sizeof(LinkList));
        if(p == NULL)
            return head;
        p -> data = x;
        tail -> next = p; //将p插入到尾节点的后面
        tail = p;   //修改尾节点的指向
        tail -> next = NULL;    //将尾节点的指针域修改为空
        cin >> x;
    }
    return head;

}
//单链表的遍历
int Print_LinkList(LinkList *head)
{
    LinkList* p = head -> next;
    if(p == NULL)
        return 0;
    while(p != NULL)
    {
        cout << p -> data << endl;
        p = p -> next;
    }
    return 1;
}
//单链表求长度
int LinkList_Length(LinkList* head)
{
    ElemType num = 0;
    LinkList * p = head;
    while(p -> next != NULL)
    {
        num++;
        p = p -> next;
    }
    return num;
}
//单链表的查找(返回指定位置的元素)
LinkList * GetDara_LinkList(LinkList * head,int i){
    LinkList * p = head;
    int num = 0; //计数器，每次加1，p的指向向后面改变一次
    if(i < 0)
        return NULL;
    while((p -> next != NULL )&&(num < i))
    {
        num++;
        p = p -> next;
    }
    if(num == i)
        cout<< p -> data < next;
    while(p != NULL)
    {
        if(p -> data != value)
            p = p -> next;
        else
            break;
    }
    cout << "查询到" << p -> data < next = p -> next;
    p -> next = s;
}
//单链表的插入(前插)
void InsertBefore_LinkList(LinkList *head,LinkList *p,LinkList *s)
{
    LinkList *q = head;
    while(q -> next != p)   //搜索P的前驱节点
        q = q -> next;
    s -> next = p;
    q -> next = s;

}
//在链表中指定位置前插入新节点s
int InsertIndex_LinkList(LinkList * head,LinkList *s,int i)
{
    LinkList *p;
    if(i <= 0) p = NULL;
    else if(i == 1) p = head;
    else
        p = GetDara_LinkList(head,i-1);
    if(p == NULL)
        return 0;
    else{
        InsertAfter_LinkList(p,s);
        return 1;
    }
}
//删除P的后继节点
int DeleteAfter_LinkList(LinkList *p)
{
    LinkList * r;
    if(!p) return 0;
    r = p -> next;
    if(!r)
        return 0;
    p -> next = r -> next;
    free(r);
    return 1;

}

int main()
{
    LinkList *L;
    //L = Creat_LinkList(); //头插法建立单链表
    L = Creat_LinkList_R(); //尾插法建立单链表
    Print_LinkList(L);  //遍历单链表
    int L_Length = LinkList_Length(L); //单链表长度
    cout << "单链表的长度为：" << L_Length <