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1】思维导图

2】完成单向循环链表的所有操作 【创建、判空、尾插、遍历、尾删、销毁】

创建：

LooplinkPtr caerte()
{LooplinkPtr h=(LooplinkPtr)malloc(sizeof(Looplink));if(NULL==h){printf("创建失败\n");return NULL;}h->len=0;h->data=0;h->next=h;printf("创建成功\n");return h;
}

判空：

int empt(LooplinkPtr h)
{if(NULL==h){printf("判空失败\n");return -1;}return h->next==h;
}

尾插：

void Tail_Add(LooplinkPtr h,DataType a)
{if(NULL==h){printf("尾插失败\n");return ;}LooplinkPtr p=node_caerte(a);LooplinkPtr p1=h;while(p1->next!=h){p1=p1->next;}p1->next=p;p->next=h;h->len++;return;
}

 遍历：

void show(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("打印失败\n");return ;}LooplinkPtr p=h;while(p->next!=h){p=p->next;printf("%d->",p->data);}putchar(10);return ;
}

 尾删：

void Tail_Del(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("尾删失败\n");return ;}LooplinkPtr p=h;for(int i=0;i<h->len-1;i++){p=p->next;}LooplinkPtr temp=p->next;p->next=h;h->len--;free(temp);temp=NULL;return ;
}

销毁：

void My_free(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("销毁失败\n");return ;}for(int i=0;i<h->len;i++){Tail_Del(h);}free(h);printf("销毁成功\n");return ;
}

运行截图：

 

源码：

#include"Looplink.h"LooplinkPtr caerte()
{LooplinkPtr h=(LooplinkPtr)malloc(sizeof(Looplink));if(NULL==h){printf("创建失败\n");return NULL;}h->len=0;h->data=0;h->next=h;printf("创建成功\n");return h;
}int empt(LooplinkPtr h)
{if(NULL==h){printf("判空失败\n");return -1;}return h->next==h;
}LooplinkPtr node_caerte(DataType a)
{LooplinkPtr p=(LooplinkPtr)malloc(sizeof(Looplink));if(NULL==p){printf("创建失败\n");return NULL;}p->data=a;return p;
}void Tail_Add(LooplinkPtr h,DataType a)
{if(NULL==h){printf("尾插失败\n");return ;}LooplinkPtr p=node_caerte(a);LooplinkPtr p1=h;while(p1->next!=h){p1=p1->next;}p1->next=p;p->next=h;h->len++;return;
}void show(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("打印失败\n");return ;}LooplinkPtr p=h;while(p->next!=h){p=p->next;printf("%d->",p->data);}putchar(10);return ;
}void Tail_Del(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("尾删失败\n");return ;}LooplinkPtr p=h;for(int i=0;i<h->len-1;i++){p=p->next;}LooplinkPtr temp=p->next;p->next=h;h->len--;free(temp);temp=NULL;return ;
}void My_free(LooplinkPtr h)
{if(NULL==h||empt(h)){printf("销毁失败\n");return ;}for(int i=0;i<h->len;i++){Tail_Del(h);}free(h);printf("销毁成功\n");return ;
}

3】完成双向循环链表的所有操作 【创建、判空、尾插、遍历、尾删、销毁】（与单向循环链表相似）

创建：

Loop_double_linkPtr caerte()
{Loop_double_linkPtr h=(Loop_double_linkPtr)malloc(sizeof(Loop_double_link));if(NULL==h){printf("创建失败\n");return NULL;}h->len=0;h->data=0;h->next=h;h->proir=h;printf("创建成功\n");return h;
}

判空：

int empt(Loop_double_linkPtr h)
{if(NULL==h){printf("判空失败\n");return -1;}return h->next==h;
}

 尾插：

void Tail_Add(Loop_double_linkPtr h,DataType a)
{if(NULL==h){printf("尾插失败\n");return ;}Loop_double_linkPtr p=node_caerte(a);Loop_double_linkPtr p1=h;while(p1->next!=h){p1=p1->next;}p->next=h;p->proir=p1;h->proir=p;p1->next=p;h->len++;return;
}

遍历：

void show(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("打印失败\n");return ;}Loop_double_linkPtr p=h;while(p->next!=h){p=p->next;printf("%d->",p->data);}putchar(10);return ;
}

 尾删：

void Tail_Del(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("尾删失败\n");return ;}Loop_double_linkPtr p=h;for(int i=0;i<h->len-1;i++){p=p->next;}Loop_double_linkPtr temp=p->next;p->next=h;h->proir=p;h->len--;free(temp);temp=NULL;return ;
}

销毁：

void My_free(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("销毁失败\n");return ;}for(int i=0;i<h->len;i++){Tail_Del(h);}free(h);printf("销毁成功\n");return ;
}

运行截图：

附源码：

#include"Loopdoublelink.h"Loop_double_linkPtr caerte()
{Loop_double_linkPtr h=(Loop_double_linkPtr)malloc(sizeof(Loop_double_link));if(NULL==h){printf("创建失败\n");return NULL;}h->len=0;h->data=0;h->next=h;h->proir=h;printf("创建成功\n");return h;
}int empt(Loop_double_linkPtr h)
{if(NULL==h){printf("判空失败\n");return -1;}return h->next==h;
}Loop_double_linkPtr node_caerte(DataType a)
{Loop_double_linkPtr p=(Loop_double_linkPtr)malloc(sizeof(Loop_double_link));if(NULL==p){printf("创建失败\n");return NULL;}p->data=a;p->next=NULL;p->proir=NULL;return p;
}void Tail_Add(Loop_double_linkPtr h,DataType a)
{if(NULL==h){printf("尾插失败\n");return ;}Loop_double_linkPtr p=node_caerte(a);Loop_double_linkPtr p1=h;while(p1->next!=h){p1=p1->next;}p->next=h;p->proir=p1;h->proir=p;p1->next=p;h->len++;return;
}void show(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("打印失败\n");return ;}Loop_double_linkPtr p=h;while(p->next!=h){p=p->next;printf("%d->",p->data);}putchar(10);return ;
}void Tail_Del(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("尾删失败\n");return ;}Loop_double_linkPtr p=h;for(int i=0;i<h->len-1;i++){p=p->next;}Loop_double_linkPtr temp=p->next;p->next=h;h->proir=p;h->len--;free(temp);temp=NULL;return ;
}void My_free(Loop_double_linkPtr h)
{if(NULL==h||empt(h)){printf("销毁失败\n");return ;}for(int i=0;i<h->len;i++){Tail_Del(h);}free(h);printf("销毁成功\n");return ;
}