tostring.cpp

// tostring.cpp
#include <iostream>
using namespace std;

class Rectangle {
public:
	void init(float _x, float _y, float _width, float _height) {
		x = _x;
		y = _y;
		width = _width;
		height = _height;
	}
	
	friend ostream& operator<<(ostream&, const Rectangle&); // optional
	float x, y;
	float width, height;	
};

ostream& operator<<(ostream &strm, const Rectangle &r) {
	return strm << "Rectangle(x=" << r.x << ", y=" << r.y << ", width=" << r.width << ", height=" << r.height << ")";
}

int main ()
{
	Rectangle r;
	r.init(10, 20, 30, 40);
	cout << r << endl;
}