list* readoutbinarfile(list* l,list* r)
{
    int d = 0;

    ifstream in("2.txt",ios::in ,ios::binary);

    in.seekg(ios_base::beg);
    list* t = new list,
          *t1 = new list;
    t->next = NULL;
    t->pre = NULL;
    l = 0;


    while (in.read((char*)& t->inf, sizeof(t->inf)) )
    {
        d++;
        if (d == 1)
        {

            l = t;
            t1 = l;
            r = t;
        }
        else
        {
            t->pre = r;
            r->next = t;
            r = t;
        }
    };

    in.close();
    return l;
}