вектора

#include "stdafx.h"

class vector
{
private: double p, q;
public:
	vector();
	vector(double a, double b);
	vector add(vector a, vector b);
	void add2(vector a, vector b);
	vector sub(vector a, vector b);
	void sub2(vector a, vector b);
	vector mult(vector a, double n);
	void mult2(vector a, double n);
	void out(vector a);////
	double lenght(vector a);
	double scalar(vector a, vector b);
	double cosv(vector a, vector b);
	bool gap(vector a, vector b);////0 не равны
};
.........................................
#include "stdafx.h"
#include "Header.h"
#include <iostream>
#include <cmath>

using namespace std;

vector::vector()
{
	p = 0;
	q = 0;
}

vector::vector(double a, double b)
{
	p = a;
	q = b;
}

vector vector::add(vector a, vector b)
{
	vector c;
	c.p = a.p + b.p;
	c.q = a.q + b.q;
	return c;
}

void vector::add2(vector a, vector b)
{
	a.p = a.p + b.p;
	b.q = a.q + b.q;
}

vector vector::sub(vector a, vector b)
{
	vector c;
	c.p = a.p - b.p;
	c.q = a.q - b.q;
	return c;
}

void vector::sub2(vector a, vector b)
{
	a.p = a.p + b.p;
	b.q = a.q + b.q;
}

vector vector::mult(vector a, double n)
{
	vector b;
	b.p = a.p*n;
	b.q = a.q*n;
	return b;
}

void vector::mult2(vector a, double n)
{
	a.p = a.p*n;
	a.q = a.q*n;
}

void vector::out(vector a)
{
	cout << '(' << a.p << ',' << a.q << ");" << endl;
}

double vector::lenght(vector a)
{
	return sqrt(a.p*a.p+a.q*a.q);
}

double vector::scalar(vector a, vector b)
{
	return (a.p+b.p+a.q*b.q);
}

double vector::cosv(vector a, vector b)
{
	return scalar(a,b)/lenght(a)/lenght(b);
}

bool vector::gap(vector a, vector b)
{
	return lenght(a)==lenght(b);
}