#ifndef CIRCLE_H
#define CIRCLE_H
 
#include <iostream>
#include <fstream>
using namespace std;
 
class Circle
{
	friend ostream& operator <<(ostream& output, const Circle& aCircle);
	friend istream& operator >>(istream& input, Circle& aCircle);
 
public:
	Circle();
	Circle(double radius, int id);
	Circle(const Circle& aCircle);
 
	void SetCircleRadius(double radius) { _circleRadius = radius; }
	void SetCircleId(int id)   { _circleId = id; }
 
	double GetCircleRadius() const   { return _circleRadius; }
	int GetCircleId() const { return _circleId; }
 
private:
	double  _circleRadius;
	int     _circleId;
};
 
#endif

#include "Circle.h"
 
Circle::Circle()
{
	_circleId = 0;
	_circleRadius = 0.0;
}
 
Circle::Circle(double radius, int id)
{
	_circleId = id;
	_circleRadius = radius;
}
 
Circle::Circle(const Circle& aCircle)
{
	_circleId = aCircle._circleId;
	_circleRadius = aCircle._circleRadius;
}
 
ostream& operator <<(ostream& output, const Circle& aCircle)
{
	output << "\n          ------------" << endl;
	output << "          Id    radius" << endl;
	output << "          ------------" << endl;
	output << "          " << aCircle._circleId << "     " << aCircle._circleRadius << endl;
	output << "          ------------" << "\n\n";
 
	return (output);
}
 
istream& operator >>(istream& input, Circle& aCircle)
{
	int quantity;
	cout << "\nHow many circles do you want to add ";
	input >> quantity;
 
	for (int i = 0; i < quantity; ++i)
	{
		cout << "\n\nEnter the ID of Circle #" << (i + 1) << " : ";
		input >> aCircle._circleId;
 
		cout << "Enter Radius of Circle #" << (i + 1) << " : ";
		input >> aCircle._circleRadius;
 
		cout << endl;
	}
 
	return (input);
}

#include <iostream>
#include <conio.h>
#include <fstream>
using namespace std;
 
#include "Circle.h"
 
int main ()
{
	Circle aCircle;
	fstream file;
	int option;
 
	do
	{
		cout << "Menu \n"
			 << " (1) Add Circle(s) \n"
			 << " (2) Find a Circle by ID \n"
			 << " (3) Exit \n"
			 << "Your Selection -> ";
		cin >> option;
 
		switch (option)
		{
		case 1:
			file.close();
			file.clear();
 
			file.open("Circle.dat", ios::out | ios::app | ios::binary);
 
			if (!file)
			{
				cerr << "\n\nFailed to open file.\n\n";
				system("PAUSE");
				exit(1);
			}
			else
			{
				cin >> aCircle;
				file.write(reinterpret_cast<char*> (&aCircle), sizeof(Circle));
			}
			break;
 
		case 2:
			file.close();
			file.clear();
 
 
			cout << "Enter id: ";
			int id;
			cin >> id;
			aCircle.SetCircleId(id);
 
			file.open("Circle.dat", ios::in | ios::app | ios::binary);
 
			if (!file)
			{
				cerr << "\n\nFailed to open file.\n\n";
				system("PAUSE");
				exit(1);
			}
			else
			{
				file.seekg(id * sizeof(Circle), ios::beg);
				file.read(reinterpret_cast<char *> (&aCircle), sizeof(Circle));
 
				cout << aCircle;
			}	
			break;
 
 
		case 3:
			file.close();
			cout << "\n\nG   o    o    D    B    y    E\n\n";
			exit(0);
			break;
 
 
		default:
			cerr << "\nERROR: Wrong Option menu. Please try again.\n\n";
 
		}
 
	} while (option != 3);
 
	return EXIT_SUCCESS;
}

int main()
{
    string word;
    fstream out("myfile.dat",ios::out | ios::binary);
    out << "Hello World\r\n";
    out.close();
    out.clear();
    out.open("myfile.dat",ios::out | ios::binary);
    out << "Hello World\r\n";
    out.close();
    out.clear();
    out.open("myfile.dat",ios::in | ios::binary);
    while( out >> word)
        cout << word << "\n";
    return 0;
}