friend友元

class jk
{
    int hj(fg &a)
    {
        return a;
    }
}
class fg
{
    friend int p(fg &l);//friend的声明
    friend class jk；//
    friend jk::hj;//
    public:

    fg(int f,string d):a(f),s(d){};
    int a;
    private:
    string s;

};
int p(fg &l)
{
    cout<<l.a<<"  "<<l.s;
}
int main()
{
    fg a(2,"dgsh");
    p(a);
}
// 2 dgsh