王道c语言ch11-单链表的新建、插入、删除例题

王道c语言ch11-单链表的新建、插入、删除例题

#include <stdio.h>
#include <stdlib.h>
#define END 33typedef int ElemType;typedef struct LNote {ElemType data;struct LNote *next;
} LNote, *LinkList;//头插法
void list_head_insert(LinkList &L) {ElemType x;L = (LinkList) malloc(sizeof(LNote));L->next = NULL;scanf("%d", &x);while (x != END) {LinkList s = (LinkList) malloc(sizeof(LNote));s->data = x;s->next = L->next;L->next = s;scanf("%d", &x);}
}//尾插法
void list_tail_insert(LinkList &L) {ElemType x;L = (LinkList) malloc(sizeof(LNote));L->next = NULL;scanf("%d", &x);LinkList s,r=L;while (x != END) {s = (LinkList) malloc(sizeof(LNote));s->data = x;r->next = s;r=s;scanf("%d", &x);}r->next=NULL;
}//打印单链表中所有结点的值
void list_print(LinkList P){P=P->next;while (P!=NULL){printf("%d   ",P->data);P=P->next;}printf("\n");
}//按位查找，返回结点
LinkList GetElem(LinkList L,int post){if (post<1){return NULL;}for (int i = 0; i < post && L; ++i) {L=L->next;}return L;
}//按值查找，返回结点
LinkList LocateElem(LinkList L,ElemType data){while (L){L=L->next;if(L->data == data){return L;}}return NULL;
}//往post的位置插入结点
bool InsertElem(LinkList L,int post,ElemType InsertData){LinkList ret = GetElem(L,post-1);if (ret){LinkList s=(LinkList) malloc(sizeof (LNote));s->data=InsertData;s->next=ret->next;ret->next=s;return true;} else{return false;}
}//删除结点
bool ListDelete(LinkList L,int i){  //不改变头结点，则不用加引用LinkList p= GetElem(L,i-1); //i=1,返回头指针//当i<=0,p=NUll，则LinkList q=p->next;会报错if(NULL==p){return false;}LinkList q=p->next;  //不直接q->next=q->next->next;是为了释放删掉的结点内存if(NULL==q){ //删除结点不存在return false;}p->next=q->next;free(q);q=NULL;//避免野指针return true;
};int main() {LinkList L;list_tail_insert(L);bool ret = InsertElem(L,2,66);{if (ret){printf("insert is ture");} else{printf("insert is fault");}}list_print(L);LinkList search = GetElem(L,2);if(search){printf("function of GetElem return %d\n",search->data);} else{printf("function of GetElem return null\n");}LinkList getdata = LocateElem(L,2);if(getdata){printf("function of LocateElem return %d\n",getdata->data);} else{printf("function of LocateElem return null\n");}ListDelete(L,4);list_print(L);return 0;
}

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