The best Example of Binary Operator Overloading in C++

#include<iostream>
using namespace std;

class Rational
{
private:
int num; // numerator
int den; // denominator
public:
void show();
Rational(int=1,int=1);
void setnumden(int,int);
Rational add(Rational object);
Rational operator+(Rational object);
bool operator==(Rational object);
bool operator!=(Rational object);
};

void Rational::show() {
cout << num << "/" << den << "\n";
}

Rational::Rational(int a,int b) {
setnumden(a,b);
}

void Rational::setnumden(int x,int y) {
int temp,a,b;
a = x;
b = y;
if(b > a) {
temp = b;
b = a;
a = temp;
}
while(a != 0 && b != 0) {
if(a % b == 0)
break;
temp = a % b;
a = b;
b = temp;
}
  num = x / b;
den = y / b;
}

Rational Rational::add(Rational object) {
int new_num = num * object.den + den * object.num;
int new_den = den * object.den;
return Rational(new_num, new_den);
}

Rational Rational::operator+(Rational object) {
int new_num = num * object.den + den * object.num;
int new_den = den * object.den;
return Rational(new_num, new_den);
}

bool Rational::operator==(Rational object) {
return (num == object.num && den == object.den);
}

bool Rational::operator!=(Rational object) {
return (num != object.num || den != object.den);
}

int main() {
Rational obj1(1,4), obj2(210,840), result1;
result1 = obj1.add(obj2);
result1.show();

Rational obj3(1,3), obj4(33,99), result2;
result2 = obj3 + obj4;
result2.show();

Rational obj5(10,14), obj6(25,35), obj7(2,3), obj8(1,2);

if(obj5 == obj6) {
cout << "The two fractions are equal." << endl;
}
if(obj7 != obj8) {
cout << "The two fractions are not equal." << endl;
}

return 0;
}