Class Data Encapsulation(private data) in operator overloading

Question

Below is the code

The Code:

#include 
using namespace std;

class Rational {
  int num;  // numerator
  int den;  // den         


        

Answer 1

Rational::operator+ is a member function, so it has access to all members of every Rational object.

Coding tip: this kind of things is usually written in two parts: an operator+= that's a member, and an operator+ that's not. Like this:

Rational& Rational::operator+=(const Rational& rhs) {
    num = num * rhs.den + den * rhs.num;
    den *= rhs.den;
    return *this;
}

Rational operator+(const Rational& lhs, const Rational& rhs) {
    Rational result(lhs);
    result += rhs;
    return result;
}