#include<stdio.h>
#include<stdlib.h>
#define N 6
typedef struct person
{
    int number;
    struct person *next;
}person;

int main()
{
    int i,count=0,n=0;
    person *head,*p1,*p2,*p;
    head=p1=p2=(person*)malloc(sizeof(person));
    head=NULL;

//创建链表并给每个结点的成员标号
    for(i=1;i<=N;i++)
   {   
      
        p1=(person*)malloc(sizeof(person));   
        p1->number=i;
        p2->next=p1;
        p2=p1;
        printf("%d ",p1->number);
    }
    p1->next=head->next;
    p2=NULL;
    printf("\nsequence that persons leave the circle:\n");

//喊到3的号码置为0
    while(count<N-1)
    {
        i=0;
        while(i!=3)
        {
            p1=p1->next;
            if(p1->number)
            i++;
        }

        printf("%d",p1->number);
        p1->number=0;
        count++;
    }
    printf("\nthe last one is:\n");

//输出号码不为0的一个
    for(i=1;i<=N;i++)
        {
        p1=p1->next;
        if(p1->number)
        printf("%3d",p1->number);
        }
        printf("\n");
        return 0;
}

main函数第三行      //head=NULL;注释掉

谢谢你