c++ - linked list and file Handling -

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i have tried write , read linked list in file couldn't succeed. file written program cannot read linked list file.

this code:

case 2:     temp = first;     while (temp != null)     {         temp->output(temp);         temp = temp->next;     }     break; case 3:  // write in file     fstream file;     file.open("group.dat", ios::app | ios::out | ios::in | ios::binary);     {         temp = first;         while (temp != null)         {              file.write(reinterpret_cast<char*>(&temp), sizeof(user));              temp = temp->next;         }     }      exit(-1); case 4:  // read file     fstream file;     file.open("group.dat", ios::app | ios::out | ios::in | ios::binary);     file.seekg(0);      while (!file.eof())     {         file.read(reinterpret_cast<char*>(&temp), sizeof(user));      }


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