Hello!

I am considerably new in C++ and need some of your advises!

Actually I am doing my assignment and getting some troubles in the way.
I am using Microsoft Visual C++ (from Visual Studio .Net 2005)

While I try to compile my code, I get the following erros:

error C3861: 'getX': identifier not found
error C3861: 'getY': identifier not found
error C3861: 'resMag': identifier not found
error C3861: 'resDir': identifier not found

It seems to me that I have to make the classes getX, getY, resMag and resDir PUBLIC. But I do not see the proper reason for that.

I am providig the code to help you out understand the problem better:

Code:
/*
   Developer  : Nirali Patel
   Course     : CSCI 201
   Project    : Assignment #1 - VECTORS
   Date       : 09/23/2006

   File             : vector.cpp
   Description: vector class.
*/

#include <iostream>
#include <stdlib.h>
#include <cmath>

using namespace std;

class vector
{
private:
	double dir; // Vector direction
	double mag; // vector magnitude

	double getX(double, double); // Get horizontal components of the vectors
                double getY(double, double); // Get vertical components if the vectors
	
                double resDir(double, double); // Resultant Directions
                double resMag(double, double); // Resultant Magnitudes

public:
	vector(); // Constructor to make the Vector NULL
                vector(vector &temp);  // Constructor to copy the Vector
	
	friend vector operator + (const vector& lhs, const vector& rhs);
	friend vector operator - (const vector& lhs, const int rhs);
	friend vector operator * (const vector& lhs, const vector& rhs);

	friend int operator == (const vector& lhs, const vector& rhs);
	friend int operator != (const vector& lhs, const vector& rhs);

	friend ostream& operator << (ostream& out, const vector& rhs);
	friend istream& operator >> (istream& out, vector& rhs);
};

/*
	Default Constructor
*/
vector::vector()
{
	dir = 0.0; // Set vector direction to NULL
	mag = 0.0; // Set vector magnitude to NULL
}

/*
	Copy Constructor
*/
vector::vector(vector &temp)
{
	dir = temp.dir; // Set vector direction to Temperory vector direction
	mag = temp.mag; // Set vector mahnitude to Temperory vector magnitude
}

/*
	Get horizontal component
*/
double vector::getX(double ang, double dist)
{
	double ans;

	ans = sin[ang*(M_PI/180)]*dist; // Horizontal (X) component

	return ans;
}

/*
	Get vertical component
*/
double vector::getY(double ang, double dist)
{
	double ans;

	ans = cos[ang*(M_PI/180)]*dist; // Vertical (Y) component

	return ans;
}

/*
	Get the resultant magnitude of 2 vectors
*/
double vector::resMag(double x, double y)
{
	double ans;

	ans = sqrt(pow(x,2)+pow(y,2));

	return ans;
}

/*
	Get the resultant direction of 2 vectors
*/
double vector::resDir(double x, double y)
{
	double ans;

	ans = atan(y/x);

	return ans;
}

/*
	Operator +
*/
vector operator + (const vector& lhs, const vector& rhs)
{
	vector ans;

	double lhsDir, rhsDir; 
	double lhsMag, rhsMag;

	double lhsX, rhsX;
	double lhsY, rhsY;

	double X, Y;

	lhsDir = lhs.dir;
	rhsDir = rhs.dir;

	lhsMag = lhs.mag;
	rhsMag = rhs.mag;

	lhsX = getX(lhsDir, lhsMag); // Get horizontal component of LHS vector
	rhsX = getX(rhsDir, rhsMag); // Get horizontal component of RHS vector

	lhsX = getY(lhsDir, lhsMag); // Get vertical component of LHS vector
	rhsX = getY(rhsDir, rhsMag); // Get vertical component of RHS vector

	X = lhsX + rhsX; // Total of all horizontal components
	Y = lhsY + rhsY; // Total od all vertical components

	ans.mag = resMag(X, Y);
	ans.dir = resDir(X, Y);

	return ans;
}
Thank you