implement copy constructor c++ Polynomial and Rational - c++

Question

I need some help to understand how to implement the constructor in the Rational class.
I try to send the numerator(p1) and denominator(p2) by reference to the rational class however it start both of them to "0" and not copy them.
the idea is to create rational that contain two Polynomial (numerator and denominator) and print them.
I didn't add all the code just what I think is relevant.
class Polynomial
{
private:
double *varibles;
static int degree;
public:
Polynomial(double * var = NULL, static int deg = NULL);
Polynomial(static int deg );
};
class Rational
{
private:
Polynomial numerator;
Polynomial denominator;
public:
Rational(const Polynomial& p1 , const Polynomial & p2 );
cpp file
Rational::Rational(const Polynomial& p1 , const Polynomial & p2 )
{
this->numerator = p1;
this->denominator = p2;
}
Polynomial::Polynomial(double * var, static int deg) {
if (deg < (sizeof(var) / sizeof(double)))
var = (double*)realloc(var, deg * sizeof(double));
this -> degree = deg;
this -> varibles = var;
}
Polynomial::Polynomial(static int deg) {
this->degree = deg;
this->varibles = (double*)calloc(deg, sizeof(double));
}
void Polynomial::setCoeff(int index, double num) {
if (!this->degree)
Polynomial(index);
this->varibles[index] = num;
}
void Polynomial::SetPolynomial(Polynomial& p) {
int size = p.degree;
int i;
for (i = 0; i < size; i++) {
cout << "Enter Number for X^ " << i+1 << " varibles" << endl;
cin >> p.varibles[i];
}
}
double Polynomial::getDegree(bool what) const {
if (what == false)
return this->degree;
else
return 0;
}
double Polynomial::getCoeff(int index) const {
return this->varibles[index];
}
int Polynomial::getMaxDegree() {
return degree;
}
void Polynomial::print() {
int size = this->degree ; // -1 ?
int i;
if (!this->degree)
cout << "Polynomial = 0";
else {
while (this->varibles[size] == 0)
size--;
if (size < 1 && this->varibles[0] == 0) {
cout << "Polynomial = 0";
}
else {
for (i = 0; i < size; i++) {
if (i == 0)
cout << this->varibles[i] << "+";
else
cout << this->varibles[i] << "X^" << i << "+";
}
cout << this->varibles[i] << "X^" << i ;
}
}
cout << endl;
}
main / test
void testRational() {
Rational r1;
r1.print();
double c[] = { 0,2,2,3,4,5 };
Polynomial p1(c, 5);
p1.print();
c[0] = 1.2;
Polynomial p2(c, 3);
Rational r2(p1, p2);
cout << "test8" << endl;
r2.print();