Lab 8 - Operator Overloading

int main() {
    int n, d;
    cout << "Fraction test program." << endl;
    char again;
    do {
        cout << "Enter numerator and denominator of first fraction:";
        cin >> n >> d;
        Fraction a(n, d);
        cout << "Enter numerator and denominator of second fraction:";
        cin >> n >> d;
        Fraction b(n, d);
        Fraction sum = a + b;
        Fraction diff = a - b;
        Fraction prod = a*b;
        Fraction quotient = a / b;
        // Display Results
        cout << a.to_string() << " + " << b.to_string() << " = " << sum.to_string() << endl;
        cout << a.to_string() << " - " << b.to_string() << " = " << diff.to_string() << endl;
        cout << a.to_string() << " * " << b.to_string() << " = " << prod.to_string() << endl;
        cout << a.to_string() << " / " << b.to_string() << " = " << quotient.to_string() << endl;

        cout << endl << "Go again? (Y or y to continue):";
        cin >> again;
    } while (again == 'Y' || again == 'y');

    return 0;
}

#include <string>
using namespace std;

class Fraction
{
public:
 // Constructors and Destructor
 Fraction(void);
 Fraction(int n, int d);
        
 // Test functions
 string to_string();

 
 // Overloaded operators
 // +, -, *, and /


private:
 int numerator; //the "top" of the fraction
 int denominator; //the "bottom" of the fraction

 // PRE: 
 // POST: Fraction is simplified, e.g. 3/9, simplifies to 1/3
 void simplify();

 // PRE:
 // POST: Returns the greatest common divisor of a and b
 int gcd(int a, int b)const;
 
 // Friend functions
        friend Fraction add(Fraction a, Fraction b);
};

#include <iostream>
#include "Fraction.h"

using namespace std;

// Default constructor
Fraction::Fraction(void)
{
 numerator = 0;
 denominator = 1;
}

// Constructor
Fraction::Fraction(int n, int d)
{
 if (d == 0){
 denominator = 1;
 numerator = 0;
 }else if (d < 0){
 denominator = d * -1;
 if (n > 0){
 numerator = n * -1;
 }
 }else{
 numerator = n;
 denominator = d;
 }
}


// Returns the greatest common divisor of two integers
int Fraction::gcd(int a, int b)const{
 while (b != 0){
 int temp = b;
 b = a % b;
 a = temp;
 }
 return a;
}

// Simplifies the calling fraction
void Fraction::simplify(){
 int factor = gcd(numerator, denominator);
 numerator = numerator / factor;
 denominator = denominator / factor;
}

//test functions
Fraction add(Fraction a, Fraction b) {
    int num = a.numerator * b.denominator + b.numerator * a.denominator;
    int den = a.denominator * b.denominator;
    Fraction result(num,den);
    result.simplify();
    return result;
}

string Fraction::to_string() {
    string result = std::to_string(numerator) + "/" + std::to_string(denominator);
    return result;
}

// Overloaded Operators
/*
 * In each case: (num1/den1) op (num2/den2)
 *
 * PLUS (+) OPERATOR
 * result = (num1 * den2 + num2 * den1) / (den1 * den2)
 *
 * MINUS (-) OPERATOR
 * result = (num1 * den2 - num2 * den1) / (den1 * den2)
 *
 * MULIPLICATION (*) OPERATOR
 * result = (num1 * num2) / (den1 * den2)
 *
 * DIVISION (/) OPERATOR
 * result = (num1 * den2) / (den1 * num2)
 * 
 */

#include <iostream>
#include "Fraction.h"

using namespace std;

int main() {
    int n,d;
    cout << "Fraction test program." << endl;
    cout << "Enter numerator and denominator of first fraction:";
    cin >> n >> d;
    Fraction a(n,d);
    cout << "Enter numerator and denominator of second fraction:";
    cin >> n >> d;
    Fraction b(n,d);    
    Fraction c = add(a,b);
    //Will be changed to use + operator
    //Fraction c = a+b;
    
    // Display Result
    cout << a.to_string() << " + " << b.to_string() << " = " << c.to_string() << endl;
    return 0;
}