用单向循环列表实现猴子选大王的程序

#include <iostream.h>
#include <string.h>
#include <stdlib.h>
using namespace std;

class node
{
    friend class linklist;
    private:   
        long int ID;
        char *Name;
        long int Tel;
        node *next;   
    public:   
        node()
        {
            next=NULL;               
        }
        node(long int &a,char *b,long int &c)//node构造函数
        {
            ID=a;strcpy(Name,b);Tel=c;
            next=NULL;   
        }
        ~node(){}
};

class linklist
{
    private:
        node *head;//头指针
        node *p;//p始终指向当前节点
        int length;
    public:   
        linklist();
        ~linklist();
        void Freelist();//释放链表内存            
        void insertBefore ();//插入一个结点
        void deletedata(int &i); //删除链表中的某一个结点
        void output();//返回输出猴子或猴子大王的相关信息
        void clearlist();//清空链表
        void chooseking();    //选择大王的过程     
};

linklist::linklist()
{
    head=p=new node();
    head->next=head;
    length=0;
}
linklist::~linklist()
{
    Freelist();
}
void linklist::Freelist()
{
    clearlist();
    delete head;
}
void linklist::clearlist()
{
    node *p;
    while (head->next!=NULL)
    {
        p=head->next;
        head->next=p->next;
        delete []p;
        length--;
    }
   
}
void linklist::insertBefore()
{
    long int a;char *b;long int c;   
    cout<<"请输入猴子的ID,name,Tel:(中间用空格隔开)"<<endl;
    cin>>a>>b>>c;
    node *q=new node(a,b,c);//这儿一直出错，但我不知道怎么改
    cout<<q->ID<<q->Name<<q->Tel;
    if(head->next==head)
    {
        q->next=head;
        head->next=q;
        p=q;
    }
    else
    {
        q->next=p;
        head->next=q;
        p=q;   
    }
    length++;
    cout<<q->ID<<q->Name<<q->Tel;   
}
void linklist::deletedata(int &i)
{
    if (i>=1)
    {
        node *q=head->next,*q1;
        for (int j=1;j<i-1;j++)
        {
            q=q->next;
        }
        q1=q->next;
        q->next=q->next->next;
        delete q1;   
        length--;
    }
    else
    cout<<"输入数据错误！"<<endl;   
}
void linklist::output()
{
        node *q=head->next;
        if (length==1)
        {
            cout<<"猴子的大王是："<<endl;
            cout<<"猴王的ID: "<<q->ID<<endl;
            cout<<"猴王的名字："<<q->Name<<endl;
            cout<<"猴王的Tel："<<q->Tel;
        }
        else
        {
            for (int i=1;i<=length;i++)
            {
                cout<<"第"<<i<<"只猴子的信息是："<<endl;
                cout<<"ID "<<q->ID<<"  "<<"name "<<q->Name<<"  "<<"Tel "<<q->Tel<<endl;
                q=q->next;
            }
        }
        
}
void linklist::chooseking()
{
    node *q=head->next,*q1;
    int a;
    do
    {        
        cout<<"你想用那个数作为筛选的基数："<<endl;
        cin>>a;
    }while (a<=0);
   
    while (head->next->next!=head)
    {
        for (int i=1;i<a-1;i++)
        {
            q=q->next;
            if (q->next==head)
                q->next=q->next->next;
            if (q==head)
                q=q->next;   
        }
        q1=q->next;
        q->next=q->next->next;
        delete q1;
        q=q->next;
    }
}

int main ()
{
    linklist monkey;
//    monkey.linklist();
    int n,i;
    cout<<"请输入猴子的只数："<<endl;
    cin>>n;   
    for(i=1;i<=n;i++)
    {
        cout<<i<<endl;
        monkey.insertBefore();
    }
    monkey.output();
    monkey.chooseking();
    monkey.output();
    monkey.~linklist();   
    return 0;
}