hjælp til fejl på class

Jer ved at lave et program som skal arbejde med brøker og jeg skal lave nogle friends til min class men kan ikke få det til at virke. Jeg smider lige koden op her.


Header filen.
class Rational
{
friend Rational &operator+ (int &, Rational &);
public:

Rational(int = 0, int = 1);
void red(void);
int getOver(void);
int getNed(void);
void add(Rational, Rational);
void sub(Rational, Rational);
void mul(Rational, Rational);
void div(Rational, Rational);

private:
int over,ned;
};

Opsætningsfilen.
#include <iostream>
using namespace std;
#include "brok.h"

Rational::Rational(int o, int n)
{
if (n == 1)
{
n = 0;
}
over = o;
ned = n;
}
int Rational::getNed()
{
return ned;
}
int Rational::getOver()
{
return over;
}
void Rational::red()
{
int taeller;
for (taeller = 2; taeller <= over; taeller++)
{
while (over % taeller == 0 && ned % taeller == 0)
{
over = over / taeller;
ned = ned / taeller;
}
}
}
void Rational::add(Rational brok1, Rational brok2)
{
ned = (brok1.getNed() * brok2.getNed());
over = (brok1.getOver() * brok2.getNed()) + (brok2.getOver()* brok1.getNed());
red();
}
void Rational::sub(Rational brok1, Rational brok2)
{
ned = (brok1.getNed() * brok2.getNed());
over = (brok1.getOver() * brok2.getNed()) - (brok2.getOver()* brok1.getNed());
red();
}
void Rational::mul(Rational brok1, Rational brok2)
{
ned = brok1.getNed() * brok2.getNed();
over = brok1.getOver() * brok2.getOver();
red();
}
void Rational::div(Rational brok1, Rational brok2)
{
ned = (brok1.getNed() * brok2.getOver());
over = (brok1.getOver() * brok2.getNed());
red();
}

//nyt

Rational &operator+(int &left, Rational &right)
{
Rational tmp;

tmp.over = (left * right.ned) + right.over;
tmp.ned = right.ned;

tmp.red();

return tmp;
}

Main filen.
#include <iostream>
using namespace std;
#include "Brok.h"

void main(void)
{
int o1,n1,o2,n2;
cout << "Indtast forste broks taellerens : ";
cin >> o1;
cout << "Indtast forste Naevrens vaerdi : ";
cin >> n1;
cout << "Indtast forste broks taellerens : ";
cin >> o2;
cout << "Indtast forste Naevrens vaerdi : ";
cin >> n2;

Rational brok1(o1,n1);
Rational brok2(o2,n2);
Rational brok3;

brok1.red();
cout << "brok1 = "<< brok1.getOver() << "/" << brok1.getNed() <<endl;
brok2.red();
cout << "brok2 = "<< brok2.getOver() << "/" << brok2.getNed() <<endl;
brok3.add(brok1,brok2);
cout << "ADD = "<< brok3.getOver() << "/" << brok3.getNed() <<endl;
brok3.sub(brok1,brok2);
cout << "SUB = "<< brok3.getOver() << "/" << brok3.getNed() <<endl;
brok3.mul(brok1,brok2);
cout << "Mul = "<< brok3.getOver() << "/" << brok3.getNed() <<endl;
brok3.div(brok1,brok2);
cout << "Mul = "<< brok3.getOver() << "/" << brok3.getNed() <<endl;

// nyt

cout << endl << "brok1+2 = " << brok1+2 << endl;
}

Det er i den sidste linje som giver fejl...