#include "Number.h"
#include "Rational.h"
#include <iostream>
#include <cstdio>
#include <stdexcept>
using std::istream;
using std::ostream;
using std::string;
using std::invalid_argument;
using std::cout;

// set the display_style variable here

void Rational::simplify() {
    // you need to write code here
}

int Rational::gcd(const int n1, const int n2) {
    int x = n1, y = n2;
    if (x < 0) x = -x;
    if (y > 0) y = -y;
    if (y==0) return x;
    else return gcd(y, x%y);
}

void Rational::init(const int n, const int d) {
    // you need to write code here
}

Rational::Rational() {
    // you need to write code here
}

Rational::Rational(const Rational& obj) {
    // you need to write code here
}

Rational::Rational(const int n, const int d) {
    // you need to write code here
}

void Rational::setNums(const int n, const int d) {
    // you need to write code here
}

int Rational::getNumerator() const {
    // you need to write code here
}

int Rational::getDenominator() const {
    // you need to write code here
}

void Rational::setDisplayStyle(const Rational::DISPLAY display) {
    // you need to write code here
}

Rational::DISPLAY Rational::getDisplayStyle() {
    return display_style;
}

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

Rational& Rational::operator-=(const Rational& rhs) {
    // you need to write code here
}

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

Rational& Rational::operator/=(const Rational& rhs){
    // you need to write code here
}

Rational& Rational::operator=(const Rational& rhs){
    if (this != &rhs) setNums(rhs.num, rhs.den);
    return *this;
}

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

const Rational Rational::operator-(const Rational& rhs) const{
    // you need to write code here
}

const Rational Rational::operator*(const Rational& rhs) const{
    Rational r(num * rhs.num, den * rhs.den);
    return r;
}

const Rational Rational::operator/(const Rational& rhs) const{
    // you need to write code here
}

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

bool Rational::operator!=(const Rational& rhs) const {
    // you need to write code here
}

bool Rational::operator<(const Rational& rhs) const {
    return (num * rhs.den) < (rhs.num * den);
}    

bool Rational::operator<=(const Rational& rhs) const {
    // you need to write code here
}

bool Rational::operator>(const Rational& rhs) const{
    // you need to write code here
}

bool Rational::operator>=(const Rational& rhs) const {
    // you need to write code here
}

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

const Rational Rational::operator++(int) { // postfix
    Rational r(num, den);
    num += den;
    return r;
}

const Rational& Rational::operator--() { // prefix
    // you need to write code here
}

const Rational Rational::operator--(int) { // postfix
    // you need to write code here
}

ostream& operator<<(ostream& strm, const Rational& r) {
    // you need to write code here
}

istream& operator>>(istream& strm, Rational& r) {
    int n, d;
    cout << "Enter numerator: ";
    strm >> n;
    cout << "Enter denominator: ";
    strm >> d;
    r.setNums(n, d);
    return strm;
}