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Simple C++ Operator Overload Problem

I'm trying to overload the division operator in C++ for a class assignment. The +, - and * are all fine, but I get a weird compilation error for division. I'm using Visual C++ 2010 Express.

Header file:

#ifndef RATIONALNUMBER_H
#define RATIONALNUMBER_H

using namespace std;

class RationalNumber
{
	friend RationalNumber operator+ (RationalNumber);	
	friend RationalNumber operator- (RationalNumber);	
	friend RationalNumber operator/ (RationalNumber);	
	friend RationalNumber operator* (RationalNumber);	

public:
	RationalNumber(int numerator, int denominator);
	System::String^ toString();
	int getNumerator();
	int getDenominator();

	RationalNumber operator+ (const RationalNumber& r) const;
	RationalNumber operator- (const RationalNumber& r) const;
	RationalNumber operator/ (const RationalNumber& r) const;
	RationalNumber operator* (const RationalNumber& r) const;
	
private:
	int _numerator;
	int _denominator;
	int _wholeNumber;
	bool isValidDenominator(const int denominator);
	void simplifyFraction();
	
};

#endif

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Compilation error I get is:
RationalNumber.h(10): error C2805: binary 'operator /' has too few parameters

Note: if I comment out the / overload, all the other 3 compile fine.

ASKER CERTIFIED SOLUTION

jkr

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rsalvati

ASKER

So you can't over load / as member function the same you would * ?

jkr

No, since it is binary. See http://msdn.microsoft.com/en-us/library/5tk49fh2%28VS.80%29.aspx ("Operator Overloading") for a list of operators you can overload and their types.

SOLUTION

Infinity08