#include "Rational.h"

// constructor
Rational::Rational(int n, int d) {  
	set(n, d); }  

bool Rational::set(int n, int d)
{
	if (d != 0) {
		num_ = n;
		den_ = d;
		return true;
	}
	else
		return false;
}

// accessor functions
int Rational::num() const { 
	return num_; }
int Rational::den() const { 
	return den_; }

// returns decimal equivalent
double Rational::decimal() const { 
	return num_ / double(den_); }

Rational Rational::operator+(const Rational &r2) const {
	Rational r;
	r.num_ = den_ * r2.num_ + r2.den_*num_;
	r.den_ = den_ * r2.den_;
	return r;
}

std::istream& operator>>(std::istream& is, Rational& r) {
	char c;

	is >> r.num_ >> c >> r.den_;
	return is;
}

std::ostream& operator<<(std::ostream& os, const Rational& r) {
	os << r.num() << "/" << r.den();
	return os;
}

bool operator<(const Rational& r1, const Rational& r2) { //precondition: r1.den_>0, r2.den > 0
	return (r1.num() * r2.den() < r2.num() * r1.den());
}