class RGBColor {

public:

	RGBColor();

	~RGBColor();

	RGBColor(ldouble a);

	RGBColor(ldouble red, ldouble green, ldouble blue);

	RGBColor(const RGBColor& c);

	RGBColor operator+(const RGBColor& c) const;

	RGBColor& operator+=(const RGBColor& c);

	RGBColor operator*(const ldouble a) const;

	RGBColor& operator*=(const ldouble a);

	RGBColor operator/(const ldouble f) const;

	RGBColor& operator/=(const ldouble f);

	RGBColor operator*(const RGBColor& c) const;

	RGBColor& operator=(const RGBColor& c);

	bool operator==(const RGBColor& c) const;

	bool operator!=(const RGBColor& c) const;

	RGBColor powc(ldouble p) const;

	ldouble average() const;

	friend std::ostream& operator<<(std::ostream& os, const RGBColor& c);

	friend std::istream& operator>>(std::istream& is, RGBColor& c);

	ldouble r, g, b;

};