作业要求：

程序代码：

#include<stdlib.h>
#include<string.h>
#include<stdio.h>
typedef struct node //定义链表节点结构体：数据域、指针域
{int data;struct node *next;
}*linklist;linklist create_node()//创建新节点并初始化，返回节点地址
{linklist s=(linklist)malloc(sizeof(struct node));if(NULL==s)return NULL;s->data=0;s->next=s;return s;
}//头插
linklist insert_head(linklist head,int element)
{linklist s=create_node();if(NULL==s)return NULL;s->data=element;if(NULL==head){head=s;return head;}linklist p=head;while(p->next!=head){p=p->next;}s->next=head;head=s;p->next=head;return head;
}//尾插
linklist insert_rear(linklist head,int element)
{linklist s=create_node();	if(NULL==s){puts("fail");return NULL;}s->data=element;if(NULL==head){head=s;return head;}linklist p=head;while(p->next!=head)p=p->next;p->next=s;s->next=head;return head;
}//输出
void output(linklist head)
{linklist p=head;while(p->next!=head){printf("%-3d",p->data);p=p->next;}printf("%-3d\n",p->data);
}//头删
linklist delete_head(linklist head)
{if(NULL==head){puts("empty");return head;		}if(head==head->next){free(head);return NULL;}linklist del=head;linklist p=head;while(p->next!=head)p=p->next;head=head->next;p->next=head;free(del);del=NULL;return head;
}//尾删
linklist delete_rear(linklist head)
{if(NULL==head){puts("empty");return head;		}if(head==head->next){free(head);return NULL;}linklist p=head;while(p->next->next!=head)p=p->next;linklist del=p->next;p->next=head;free(del);del=NULL;return head;
}//约瑟夫环
void josephus(linklist head,int len,int m)
{linklist p=head;for(int i=1;i<=len;i++){for(int j=1;j<=m-2;j++){p=p->next;}linklist del=p->next;printf("%-3d" ,del->data);p->next=del->next;free(del);p=p->next;}puts("");
}//排序
void simple_sort(linklist head)
{linklist p=head;for(p;p->next!=head;p=p->next){linklist min=p;for(linklist q=p->next;q!=head;q=q->next){if(min->data > q->data)min=q;}if(min!=p){int t=min->data;min->data=p->data;p->data=t;}}
}
int main(int argc, const char *argv[])
{linklist head=NULL;int len;printf("please input length:");scanf("%d",&len);
//	int element;
//	for(int i=0;i<len;i++)
//	{
//		printf("please input %d element:",i+1);
//		scanf("%d",&element);
//		head=insert_head(head,element);//头插
//		head=insert_rear(head,element);//尾插
//	}		
//	simple_sort(head);//排序
//	output(head);//输出
//	head=delete_head(head);//头删
//	head=delete_rear(head);//尾删
//	output(head);//代码实现约瑟夫环for(int i=1;i<=len;i++){head=insert_rear(head,i);//根据长度循环尾插输入约瑟夫环内数值；}output(head);//遍历int m;printf("please input m of the josephus:" );scanf("%d",&m);josephus(head,len,m);head=delete_head(head);//头删head=delete_head(head);output(head);head=delete_rear(head);//尾删output(head);return 0;
}

运行结果：