C++单链表2

LinkList：

#include<iostream>
using namespace std;
typedef int elemType;

typedef struct Node
{
    elemType data;
    Node *next;
}*LinkList;

bool InitList(LinkList *L)//初始化
{
    *L = new Node;
    if(!L)
        return false;
    (*L)->next = NULL;
    return true;
}

bool IsEmpty(LinkList L)
{
    if(L->next==NULL)
        return false;
    else
        return true;
}

bool ClearList(LinkList *L)
{
    cout<<"Clear List."<<endl;
    LinkList p,q;
    p = (*L)->next;
    if(!p)
        return true;
    while(p)
    {
        q = p->next;
        delete p;
        p=q;
    }
    (*L)->next = NULL;
    return true;
}

int LengthList(LinkList *L)
{
    //cout<<"The length of list is:";
    LinkList p;
    p = (*L)->next;
    int i=0;
    while(p)
    {
        p=p->next;
        i++;
    }
    return i;
}

bool GetElem(LinkList *L, int pos, elemType *pd)
{
    cout<<"Get the "<< pos <<"th item:";
    LinkList p;
    p = (*L)->next;
    int i=1;
    while(p && i<pos)
    {
        p = p->next;
        i++;
    }
    if(!p || i>pos)
        return false;
    *pd = p->data;
    return true;
}

//在L中第pos个结点位置之前插入新数据元素x
bool InsertList(LinkList *L, int pos, elemType x)
{
    LinkList p,q;
    int i=1;
    p = *L;
    while(p && i<pos)
    {
        p = p->next;
        i++;
    }
    if(!p || i>pos)
        return false;
    q = new Node;
    q->data = x;
    q->next = p->next;
    p->next = q;
    return true;
}

bool DeleteList(LinkList *L, int pos, elemType *y)
{
    int i =1;
    LinkList p,q;
    p = *L;
    while(p->next && i<pos)
    {
        p = p->next;
        i++;
    }
    if(!(p->next) || i>pos)
        return false;
    q = p->next;
    *y = q->data;
    p->next = q->next;
    delete q;
    return true;
}

int Locate(LinkList *L,elemType z)
{
    int i=1;
    LinkList p;
    p = (*L)->next;
    while(p && p->data!= z)
    {
        p = p->next;
        i++;
    }
    if(!p)
        return 0;
    return i;
}

void PrintList(LinkList *L)
{
    LinkList p;
    p = (*L)->next;
    int i=1;
    while(p)
    {
        cout << i << ":	"<< p->data <<endl;
        p = p->next;
        i++;
    }
}

LinkList *Reverse(LinkList *L)//反转单链表
{
    cout<<"Reverse List:"<<endl;
    LinkList p,q,s;
    if((*L)->next->next==NULL || (*L)->next==NULL)
        return L;
    p = (*L)->next;
    q = p->next;
    (*L)->next->next = NULL;
    while(q)
    {
        s = q->next;
        q->next = p;
        p = q;
        q = s;
    }
    (*L)->next = p;
    return L;
}

int main()
{
    LinkList L;
    InitList(&L);
    for(int i=1;i<7;i++)
        InsertList(&L,i,i);
    PrintList(&L);
    cout<<endl;

    int x = Locate(&L,2);
    cout<<"the location of 2 is: "<< x << endl;
    cout<<endl;

    cout<<"after delete the 6th item:"<<endl;
    int num;
    DeleteList(&L,6,&num);
    PrintList(&L);
    cout<<endl;

    Reverse(&L);
    PrintList(&L);
    cout<<endl;

    return 0;
}