#ifndef h8_h_#define h8_h_#include<iostream>#include<cmath>using namespace std;class Vector{private:	double x;			//坐標x,y	double y;	double direction;		//方向	double length;			//大小public:	Vector(double x_ = 0,double y_ = 0);	Vector(const Vector& temp);	~Vector();	void set_length();			//獲得長度	void set_dirextion();		//獲得方向	Vector operator+(const Vector& temp)const;		//重載函數	Vector operator-(const Vector& temp)const;	Vector operator*(const Vector& temp)const;	Vector& operator=(const Vector& temp);	Vector& operator--();	Vector& operator++();	Vector operator++(int);	Vector operator--(int);	friend double operator*(double i,Vector& temp);	friend ostream& operator<<(ostream& out,Vector& temp); };#endif