class MechanicBill
{
private:
	int brake_pads;
	int tires;
	double quarts_oil;
	double parts_cost;
	double labor_cost;
	double tax_cost;
	double total_cost;
	void calc_parts_cost();
	void calc_labor_cost();
	void calc_tax_cost();

public:
	MechanicBill();
	MechanicBill(int, int, double);
	void set_brake_pads(int);
	void set_tires(int);
	void set_oil(double);
	void calc_total();


	friend MechanicBill operator +(const MechanicBill bill1, const MechanicBill& bill2);

	friend bool operator ==(const MechanicBill& bill1, const MechanicBill& bill2);

	friend std::ostream& operator <<(std::ostream& outs, const MechanicBill& bill);

};