求C++编程帮忙(using friend method)

#include<iostream.h>
#include<string.h>

class Point;

class Information
{
    friend class Point;
private:
    char name[30],id[10];
public:
    void setdata(char *,char *);
};

void Information::setdata(char * a,char * b)
{
    strcpy(name,a);
    strcpy(id,b);
}
class Point
{
    int cumulated_point,current_point,total_point;

public:
    void set_point(int,int);
    void calculate_point();
    void display(Information);
};

void Point::set_point(int point1,int point2)
{
    cumulated_point=point1;
    cumulated_point=point2;
}

void Point::calculate_point()
{
    total_point=cumulated_point + current_point;
}

void Point::display(Information a)
{
    cout<<"Member's Name:"<<a.name<<"\n";
    cout<<"ID :"<<a.id<<"\n";
    cout<<"Total Point :"<<total_point<<"\n";

    if (total_point> 1000)
        cout<<"Qualified to be VIP Member.";
    else
        cout<<"Not qualified to be VIP Member.";
    cout<<'\n';
}

void main()
{
    char name[30],id[10];
    int cumulated_point,current_point;
    Point a;
    Information b;
    cout<<"Name:";
    cin.getline(name,30);
    cout<<"ID :";
    cin.getline(id,10);
    cout<<"Cumulated Point :";
    cin>>cumulated_point;
    cout<<"Current Point :";
    cin>>current_point;
    cout<<'\n';
    b.setdata(name,id);
    a.set_point(cumulated_point,current_point);
    a.calculate_point();
    a.display(b);
}