#include <iostream>
#include <cstring>
using namespace std;
typedef bool Status;

typedef struct
{
    char no[20];
    char name[50];
    float price;
}Book;

typedef struct LNode{
    Book book;
    struct LNode *next;}LNode,*LinkList;

Status InitList(LinkList &L){
    L = new LNode;
    L->next=NULL;
    return true;
}

LNode *LocateBook(LinkList L,Book book){
    LNode *p = L->next;//p指向首元结点
    while(p && strcmp(p->book.no,book.no))
        p=p->next;
    return p;
}

Status ListInsert(LinkList &L,int i,Book book){
        LNode *p =L; int j=0;
    while(p && (j<i-1)){
        p=p->next;
        ++j;
    }
    if(!p||j>i-1) return false;
    LNode *s = new LNode;
    s->book = book;
    s->next = p->next;
    p->next = s;
    return true;
}

Status ListDelete(LinkList &L,int i){
    LNode *p=L;int j=0;
    while((p->next)&&(j<i-1)){
        p=p->next;
        ++j;
    }
    if(!(p->next)||(j>i-1)) return false;
    LNode * q =p->next;
    p->next = q->next;
    delete q;
    return true;
}

Status ListModify(LinkList &L, Book book){
    LNode *p = LocateBook(L,book);
    if (p==NULL) return false;
    p->book.price = book.price;
    return true;
}

int ListCount(LinkList L){
     LNode *p = L->next;
     int count = 0;
     while (p)
     {
         p=p->next;
         count++;
     }
     return count;
}
int main(){
    Book bookA;
    strcpy(bookA.no,"9787302257646");
    strcpy(bookA.name,"Basic");
    bookA.price = 25;

    LinkList L;
    InitList(L);
    ListInsert(L,1,bookA);

    cout<<"priceA"<<LocateBook(L,bookA)->book.price<<endl;
    bookA.price =35;
    ListModify(L, bookA);
    cout<<"priceA"<<LocateBook(L,bookA)->book.price<<endl;

    Book bookB;
    strcpy(bookB.no,"9787302219972");
    strcpy(bookB.name,"Apply");
    bookB.price = 32;

    cout<<"ListInsertB"<<ListInsert(L,2,bookB)<<endl;
     cout<<"ListCount"<<ListCount(L)<<endl;

    cout<<"deleteA"<<ListDelete(L,1)<<endl;
     cout<<"ListCount"<<ListCount(L)<<endl;

    return 0;
}