Problem with Classes and Accessing Private Members

[jason18241]

I am getting error C2248 - cannot access private member declared in class 'Complex'. I understand what the error means, but I don't understand why it is occurring, and thus how to fix it. This code snippet is part of a homework assignment, whose idea is overloading operators and constructors. I am a C++ newbie, so please bare that in mind in your explanations. I am NOT looking to have anyone do my homework for me, but I've hit a brick wall and need to understand why these errors are popping up.

#include <iostream>
#include <math.h>
using namespace std;

class Complex {
	Complex(double realValue, double imaginaryValue);
	Complex(double realPart);
	Complex();
public:
	double getReal();
	double getImaginary();
private:
	double real, imaginary;
};

int main() {
	/*
   Complex one, two(3.2), x(2.7, 18.2), y(15.3,9.72);
   cout << x << " + " << y << " = " << (x + y) << endl;
   cout << x << " - " << y << " = " << (x - y) << endl;
   cout << x << " * " << y << " = " << (x * y) << endl;
   cout << ((one == (two - two))? "Equal" : "Not equal") << endl;
   cout << ((x == y) ? "Same" : "Not same") << endl;
   return 0;
   */
}

bool operator == (Complex value1, Complex value2) {
	return ( ( value1.getReal()==value2.getReal() ) && ( value1.getImaginary()==value2.getImaginary() ) );
}

Complex operator + (Complex value1, Complex value2) {
	double totalReal = value1.getReal()+value2.getReal();
	double totalImaginary = value1.getImaginary()+value2.getImaginary();
	return Complex(totalReal, totalImaginary); //error
}

Complex operator - (Complex value1, Complex value2) {
	double totalReal = value1.getReal()-value2.getReal();
	double totalImaginary = value1.getImaginary()-value2.getImaginary();
	return Complex(totalReal, totalImaginary); //error
}

Complex operator * (Complex value1, Complex value2) {
	double a = value1.getReal();
	double b = value1.getImaginary();
	double c = value2.getReal();
	double d = value2.getimaginary();
	return ( (a*c-b*d)+(a*d+b*c)*pow(-1, .5) );

}

double Complex::getReal() {
	return real;
}

double Complex::getImaginary() {
	return imaginary;
}

Complex::Complex(double realValue, double imaginaryValue) {
	real = realValue;
	imaginary = imaginary*pow(-1, .5);
}

Complex::Complex(double realPart) {
	real = realPart;
	imaginary = 0*pow(-1, .5);
}

Complex::Complex() {
	real = 0;
	imaginary = 0*pow(-1, .5);
}

Thanks,
-Jason