iostream operator overloading in header

Hey, so i've looked around online for a bit, and after finding similar, but not exact (as in it doesn't help me), i'm gonna post my problem here :P.
I'm working on a class to handle Complex numbers. This is going to require a lot of operator overloads and the sort to handle the different operations i need to test. Well one of the things that i need to do is be able to use the << and >> operators to input/output data so things are read/shown properly. My header file is below:

// ********************************************************
	// Complex.h
	//
	// Summary: This file is used to declare the Complex class.
	//					
	// Author: Andrew Stoker & Gregory Devos
	// Created: Feb 2011
	// Summary of Modifications:
	//	
	//  ©Copyright Cedarville University, its Computer Science faculty, and the 
	//  authors.  All rights reserved.
	//  *******************************************************


#ifndef COMPLEX_H
#define COMPLEX_H

class Complex {
	
public:
	
	Complex(); 
	
	Complex(double rNum); 
	
	Complex(double rNum, double iNum);
	
		//Facilitators
	Complex add(const Complex &c, const Complex &d) const;
	
	Complex subtract(const Complex &c, const Complex &d) const;
	
	Complex multiply(const Complex &c, const Complex &d) const;
	
	Complex divide(const Complex &c, const Complex &d) const;
	
	Complex equal(const Complex &c, const Complex &d) const;
	
	Complex gT(const Complex &c, const Complex &d) const;  //Greater Than
	
	Complex lT(const Complex &c, const Complex &d) const;  //Less Than
	
	Complex gTE(const Complex &c, const Complex &d) const; //Greater Than Equal
	
	Complex lTE(const Complex &c, const Complex &d) const; //Less Than Equal 
	

	
	
protected:
		//setters & getters
		//void setComplex(double realNum, double imagNum);
	
		//Complex getComplex(double realNum, double imagNum);
	
	
private:
	
	double realVal;
	double imagVal;
	
};

Complex operator+ (const Complex &r, const Complex &s);
Complex operator- (const Complex &r, const Complex &s);
Complex operator* (const Complex &r, const Complex &s);
Complex operator/ (const Complex &r, const Complex &s);
Complex operator== (const Complex &r, const Complex &s);
	//Complex operator= (const Complex &r);
Complex operator!= (const Complex &r, const Complex &s);
Complex operator< (const Complex &r, const Complex &s);
Complex operator> (const Complex &r, const Complex &s);
Complex operator<= (const Complex &r, const Complex &s);
Complex operator>= (const Complex &r, const Complex &s);



ostream& operator<< (ostream &sout, const Complex &r);
istream& operator>> (istream &sin, Complex &r);


#endif

Now, the error i'm getting is, "Expected constructor, destructor, or type conversion before '&' token. And i'm getting this error for these two lines of code near the end of the program:

ostream& operator<< (ostream &sout, const Complex &r);
istream& operator>> (istream &sin, Complex &r);

So the question is, how do i properly implement this operator overload so that inside the Complex.cpp file, i can handle the outputs properly?

[caut_baia]

They must be declared as friends inside the class's scope.Try that

They must be declared as friends inside the class's scope.Try that

Is there any way i can use it without declaring it as friend inside the class?

[caut_baia]

Not from what i know.

Not from what i know.

Well, it works. So i'll take it :P. Thanks man.