fstream

open file and read.
  fstream file("emp.bin",ios::in|ios::binary);

  file.read((char*)&E, sizeof(Employee));

  file.seekg(-((ios::pos_type)(sizeof(Employee)*2)), ios::cur);

stack template

template <class T>
class Stack;
template <class T>
class Node{
  T _data;
  Node<T>* _next;
  Node(T data, Node<T>* next);
  friend class Stack<T>;
};
template <class T>
class Stack{
  Node<T>* _top;
public:
  Stack(void);
  virtual ~Stack(void);
  void push(T data);
  T pop(void);
  bool isEmpty(void);
};

template <class T>
Node<T>::Node(T data, Node<T>* next){
  _data = data;  // T must be ok with operator =
  _next = next;
}

template <class T>
Stack<T>::Stack(void){
  _top = (Node<T>*)0;
}
template <class T>
Stack<T>::~Stack(void){
  Node<T>* toDel;
  while(_top){
    toDel = _top;
    _top = _top->_next;
    delete toDel;
  }
}

template <class T>
void Stack<T>::push(T data){
  Node<T>* tempnode = new Node<T>(data, _top);
  _top = tempnode;
}
template <class T>
T Stack<T>::pop(void){
  T ret = _top->_data; // T needs should be ok with copying
  Node<T>* toDel = _top;
  _top = _top->_next;
  delete toDel;
  return ret;
}
template <class T>
bool Stack<T>::isEmpty(void){
  return _top == (Node<T>*)0;
}

very important ---- set bit pattern

void printBits(unsigned int V){
  for(int i=sizeof(unsigned int)*8-1;i>=0;!((i+1)%4) && putchar(' '),putchar('0' + !!(V & (1<<i))), (!i) && putchar('\n'),i--);
}
void SetBitPattern(unsigned int& val, const char* bitPattern, int startBitIndex){
  int i = -1;
  while(bitPattern[++i]);
  while(i--){
    if(bitPattern[i]-'0'){
      val = val | 1 << startBitIndex;
    }
    else{
      val = val & ~(1 << startBitIndex);
    }
    startBitIndex++;
  }
}