RationalNumbersAddition.cpp

// RationalNumbers.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>

using namespace std;

class RationalNumber {
    int numerator;
    int denominator;

public:
    // Constructor
    RationalNumber(int p=1, int q=1) {
        setNumerator(p);
        setDenominator(q);
    }
    
    // Copy Constructor
    RationalNumber(RationalNumber& r) {
        numerator = r.numerator;
        denominator = r.denominator;
    }

    // Accessors
    void setNumerator(int p) { numerator = p; }
    int getNumerator() { return numerator; }

    void setDenominator(int q) { 
        if (q > 0) 
            denominator = q; 
    }
    int getDenominator() { return denominator; }

    // Overload + operator
    friend RationalNumber operator+(RationalNumber &num1, RationalNumber &num2);
    // Overload insertion (to display) operator
    friend ostream & operator<<(ostream &out, RationalNumber &num);
};

RationalNumber operator+(RationalNumber& num1, RationalNumber& num2) 
{
    RationalNumber temp;
   
    temp.numerator = (num1.numerator * num2.denominator) + (num2.numerator * num1.denominator);
    temp.denominator = num1.denominator * num2.denominator;

    return temp;
}

ostream& operator<<(ostream& out, RationalNumber& num) 
{
    cout << num.numerator << "\\" << num.denominator;
    return out;
}

int main()
{
    RationalNumber num1(3, 4), num2(2, 5), num3;

    num3 = num1 + num2;

    cout<<"Sum of "<<num1<<" and "<<num2<<" is "<<num3<<endl;
}