c++运算符重载（有理数加减乘除）

// ConsoleApplication11.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<string>
//#include<stdlib.h>
class Rational
{
public:
	Rational(int num, int denom);
	Rational operator+(Rational rhs);
	Rational operator-(Rational rhs);
	Rational operator*(Rational rhs);
	Rational operator/(Rational rhs);
	void print();
private:
	void normalize();
	int numerator;
	int denominator;
};

Rational::Rational(int num, int denom)
{
	numerator = num;
	denominator = denom;
	normalize();
}


//标准化
void Rational::normalize()
{
	if (denominator < 0)
	{
		numerator = -numerator;
		denominator = -denominator;
	}

	//求出分子和分母的最大公约数，用欧几里得算法
	int a = abs(numerator);
	int b = abs(denominator);
	while (b>0)
	{
		int t = a%b;
		a = b;
		b = t;
	}
	numerator /= a;
	denominator /= a;
}

Rational Rational::operator+(Rational rhs)
{
	int a = numerator;
	int b = denominator;
	int c = rhs.numerator;
	int d = rhs.denominator;
	int e = a*b + c*