C++ Problem

I must have the operators for +,-,*,/, set up incorectly. The implemintation file gives me errors, but I dont understand why. The operator<< is working properly when tested. Any help would be greatly appreciated, Thank You!

// Rational.h

#ifndef Rational_H

#define Rational_H

#include

using namespace std;

class Rational {

private:

int numerator, denominator;

void reduce(int&, int&);

public:

Rational(int n, int d);

friend ostream& operator<<(ostream& y, const Rational& out);

friend Rational operator+(Rational a, Rational b);

friend Rational operator-(Rational a, Rational b);

friend Rational operator*(Rational a, Rational b);

friend Rational operator/(Rational a, Rational b);

};

#endif

//implemination.cpp

#include #include"Rational.h" using namespace std;

Rational::Rational(int numer, int denom) {

reduce(numer, denom);

numerator = numer;

denominator = denom;

}

void Rational::reduce(int &numer, int &denom) {

if (numer < 0 && denom < 0) {//If both Denominator and Numerator are negative, it equals positive

numer *= -1;

denom *= -1;

}

if (numer < 0) { //If numerator is negative it temporarly makes it positive until end of if-statement

numer *= -1;

for (int r = denom * numer; r > 1; r--) {

if ((denom % r == 0) && (numer % r == 0)) {

denom /= r;

numer /= r;

}

}

numer *= -1;

}

if (denom < 0) {

numer *= -1; //If denominator is negative it formats it so negative comes before numerator at end

for (int r = denom * numer; r > 1; r--) {

if ((denom % r == 0) && (numer % r == 0)) {

denom /= r;

numer /= r;

}

}

denom *= -1;

}

else // If both positive no changes are made

for (int r = denom * numer; r > 1; r--) {

if ((denom % r == 0) && (numer % r == 0)) {

denom /= r;

numer/= r;

}

}

}

ostream& operator<<(ostream& y, const Rational& out ) {

if (out.denominator == 1)

y << out.numerator << endl;

else

y << out.numerator << "/" << out.denominator << endl;

return (y);

}

Rational operator+(Rational a, Rational b) {

a.numerator *= b.denominator;

a.denominator *= b.denominator;

b.numerator *= a.denominator;

b.denominator *= a.denominator;

Rational result(a.numerator+b.denominator / b.denominator);

return result;

}

Rational operator-(Rational a, Rational b) {

a.numerator *= b.denominator;

a.denominator *= b.denominator;

b.numerator *= a.denominator;

b.denominator *= a.denominator;

Rational result(a.numerator + b.denominator / b.denominator);//

return result;

}

Rational operator*(Rational a, Rational b) {

Rational result((a.numerator*b.numerator) / (a.denominator*b.denominator));

return result;

}

Rational operator/(Rational a, Rational b) {

Rational result((a.numerator*b.denominator) / (a.denominator*b.numerator));

return result;

}