#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>

class IP_Address {
	friend ostream &operator<<(ostream&, const *IP_Address);
public:
	int n1, n2, n3, n4;
};

ostream &operator<<(ostream &output, const IP_Address &ip)
{
	output << ip.n1 << "." << ip.n2 << "." << ip.n3 << "." << ip.n4;
	return output;
}

class Member {
	friend ofstream &operator<<(ofstream&, const Member &m);
public:
	void Display(void);
	void SetInfo(void);
private:
	char Name[40];
	char Handle[40];
	IP_Address IP;
	int Age;
	float Score;
};

ofstream &operator<<(ofstream &output, const Member &m)
{
	output.write((const char*)(&m), sizeof(Member));
	return output;
}

int ClearError(istream& isIn)     // Clears istream object
{
  streambuf* sbpThis;
  char szTempBuf[20];
  int nCount, nRet = isIn.rdstate();

  sbpThis = isIn.rdbuf();         // Get streambuf pointer
  nCount = sbpThis->in_avail();   // Number of characters in buffer

  if ((nRet) || (nCount)) {       // Any errors or characters left?
    isIn.clear();                 // Clear error flags

    while (nCount) {              // Extract them to szTempBuf
      if (nCount > 20) {
        sbpThis->sgetn(szTempBuf, 20);
        nCount -= 20;
      }
      else {
        sbpThis->sgetn(szTempBuf, nCount);
        nCount = 0;
      }
    }
  }
  return  nRet;
}

void Member::SetInfo(void)
{
	ClearError(cin);
	cout << "Please enter handle: ";
	cin.getline(Handle, 40);
	cout << "Please enter name: ";
	cin.getline(Name, 40);
	cout << "Please enter age: ";
	cin >> Age;
	cout << "Please enter score: ";
	cin >> Score;
	cout << "Please enter your IP numbers: ";
	cin >> IP.n1 >> IP.n2 >> IP.n3 >> IP.n4;
}

void Member::Display(void)
{
	cout << "Handle: " << Handle << endl;
	cout << "Name:   " << Name << endl;
	cout << "IP:     " << IP << endl;
	cout << "Age:    " << Age << endl;
	cout << "Score:  " << setiosflags(ios::fixed | ios::showpoint) << Score << endl;
}

void PrintNth(int n, ifstream &fp)
{
	Member temp;
	fp.seekg(n * sizeof(Member));
	fp.read((char*)(&temp), sizeof(Member));
	temp.Display();
}

void main(void)
{
	Member temp;

	cout << "Member is " << sizeof(Member) << " bytes long." << endl << endl;

	ofstream outBin("output.bin", ios::out);

	temp.SetInfo();
	outBin << temp;

	temp.SetInfo();
	outBin << temp;

	temp.SetInfo();
	outBin << temp;

	cout << endl << "Closing file" << endl << endl;

	outBin.close();
	
	cout << endl << "Opening file" << endl << endl;

	ifstream inBin("output.bin", ios::in);

	cout << "Entry 1" << endl;
	PrintNth(1, inBin);
	cout << endl << "Entry 0" << endl;
	PrintNth(0, inBin);
	cout << endl << "Entry 2" << endl;
	PrintNth(2, inBin);

	inBin.close();
}