定义一个有理数类，重载比较运算符＜、＞、==，设计一主函数来测试上述运算符。（c++中运算符重载的基本用法）

  c++中运算符重载的基本用法

要求使用以下类的声明，来测试运算符重载。

class rational
{
public:
//构造函数
rational(int num,int denom);
//重载比较操作符
bool operator<(rational r) const;
bool operator>(rational r) const;
bool operator==(rational r) const;
private:
//定义一个有理数num为分母，den为分子
long num,den;
};

 话不多说，直接上代码！！！

#include 
using namespace std;

class rational{
public:
	//构造函数
	rational(int num, int denom) {};
	//重载比较操作符
	bool operator<(rational r) const;
	bool operator>(rational r) const;
	bool operator==(rational r) const;
                              
private:
	//定义一个有理数num为分母，den为分子
	long num, den;
};


bool rational::operator<(rational r)const {
	if (r.den / r.num < den / num)
		return 1;
	else
		return 0;
}

bool rational::operator>(rational r)const {
	if (r.den / r.num > den / num)
		return 1;
	else
		return 0;

}

bool rational::operator==(rational r)const {
	if (r.den / r.num == den / num)
		return 1;
	else
		return 0;

}

int main()
{
	int w;
	rational a(3,4);
	rational b(4, 4);
	rational c(4,5);
	rational d(4, 5);
	w = (a > b);
	if (a > b)	cout << "a>b" << "    " <<  w << endl;
	else  cout << "等式不成立" << endl;
	w = (c == d);
	if (c == d)	cout << "c=d" << "    " <<  w << endl;
	else  cout << "等式不成立" << endl;
}