Thread: Why am I getting 'undelcared identifier' ???

Hello all,

I am creating a complex number class. Here is the header file 'Complex.h' :

Code:

//February 15, 2006
//Complex class declaration and definition file

class Complex
{
	double real, imag;
public:
	Complex();
	Complex(const Complex&);		//Copy constructor (so you can do '=' @ declaration)
	Complex(const double&);				//Conversion constructor
	Complex(const double&, const double&);
	Complex conj(const Complex&);
	Complex operator+(const Complex&);
	Complex operator-(const Complex&);
	Complex operator*(const Complex&);
	Complex operator/(Complex&);
	Complex operator=(const Complex&);
	double Re(const Complex&);
	double Im(const Complex&);
	friend ostream& operator <<(ostream&, Complex&);
	friend istream& operator >>(istream&, Complex&);
};

Complex::Complex()
{
	real = imag = 0.;
}

Complex::Complex(const Complex &a)
{
	real = a.real;
	imag = a.imag;
}

Complex::Complex(const double &a)
{
	real = a;
	imag = 0;
}

Complex::Complex(const double &a, const double &b)
{
	real = a;
	imag = b;
}

Complex Complex::operator +(const Complex &num)
{
	real = real + num.real;
	imag = imag + num.imag;
	return *this;
}

Complex Complex::operator -(const Complex &num)
{
	real = real - num.real;
	imag = imag - num.imag;
	return *this;
}

Complex Complex::conj(const Complex &another)
{
	real = another.real;
	imag = -another.imag;
	return *this;
}

Complex Complex::operator *(const Complex &num)
{
	double a = real, b = imag, c = Re(num), d = Im(num);
	real = a*c - b*d;
	imag = a*d + b*c;
	return *this;
}

Complex Complex::operator /(Complex &den)
{
	Complex den_star = conj(den);
	double new_den = Re(den_star * den);
	*this = *this * den_star;
	real = real / new_den;
	imag = imag / new_den;
	return *this;
}

Complex Complex::operator =(const Complex &another)
{
	real = another.real;
	imag = another.imag;
	return *this;
}

double Complex::Re(const Complex &a)
{
	return a.real;
}

double Complex::Im(const Complex &a)
{
	return a.imag;
}

Here is the main cpp file:

Code:

#include <iostream.h>
#include "Complex.h"

ostream& operator <<(ostream &out, Complex &a)
{
	if(a.real != 0)
		out<<a.real;
	if(a.imag < 0)
		out<<" - j"<<-a.imag;
	if(a.imag > 0)
		out<<" + j"<<a.imag;
	if(a.real == 0 && a.imag == 0)
		out<<"0";
	return out;
}

istream& operator >>(istream &in, Complex &a)
{
	in>>a.real>>a.imag;
	return in;
}

int main()
{
	Complex a(3,5);
	cout<<a<<endl;
	Complex b(-1,-2);
	cout<<b<<endl;

	cout<<"----------------------"<<endl;
	cout<<conj(a)<<endl;

	return 0;
}

For some reason, I am getting an "undeclared identifier" error in the main program when I call the conj(a) function, but it is clearly defined in the main program (and it is a very simple function). Maybe the answer is right in front of me, but I've been looking at it so much that I just don't see anything anymore. Thanks for all your help.

Best,

Bill83

Code:

cout<<conj(a)<<endl;

conj is a member of the complex class you would call it like this

Code:

cout<<a.conj(a)<<endl;

Thanks a lot. Like I said, the answer was right there. Most of my questions are this stupid, due to excessive programming.