please fix the code c++: (Don't change QT classes)

#include

#include

QTextStream cout(stdout);

QTextStream cin(stdin);

class Fraction {

private:

int m_Numberator;

int m_Denominator;

public:

Fraction() {

set(m_Numberator,m_Denominator);

}

void set(int numerator, int denominator) {

m_Numberator = numerator;

m_Denominator = denominator;

}

Fraction add(Fraction& other) {

Fraction temp;

temp.m_Denominator=m_Denominator+other.m_Denominator;

temp.m_Numberator=m_Numberator+other.m_Denominator;

return temp;

}

Fraction substact(Fraction& other){

Fraction temp;

temp.m_Denominator=m_Denominator-other.m_Denominator;

temp.m_Numberator=m_Numberator-other.m_Denominator;

return temp;

}

Fraction multiply(Fraction& other){

Fraction temp;

temp.m_Denominator=m_Denominator*other.m_Denominator;

temp.m_Numberator=m_Numberator*other.m_Denominator;

return temp;

}

Fraction divide(Fraction& other){

Fraction temp;

temp.m_Denominator= m_Denominator/other.m_Denominator;

temp.m_Numberator=m_Numberator/other.m_Denominator;

return temp;

}

double toDouble() {

return double (m_Denominator);

}

QString toString() {

return QString("This is the numberator This is the Denominator This is divition This is multiply This is substraction This is addition ").arg(m_Numberator).arg(m_Denominator).arg(m_Numberator/m_Denominator).arg(m_Numberator*m_Denominator).arg(m_Numberator-m_Denominator).arg(m_Numberator+m_Denominator);

}

};

int main()

{

Fraction f;

Fraction f2;

Fraction c;

f.set(3, 2);

f2.set(6, 9);

c = f.add(f2);

cout<< f.toString() << endl;

cout<< c.toString() << endl;

}