5-1 C++ 运算符重载综合

题目

设计一个 Fraction 类，包含数据成员 numerator（分子）和 denominator（分母），请定义相关运算符重载函数使下面 main 函数中的语句都可以正确运行。

代码

#include <iostream>
using namespace std;
class Fraction
{
	public:
		Fraction(int a,int b){numerator = a;denominator = b;}
		const Fraction operator + (const Fraction& c); //重载+
		Fraction operator = (const Fraction& d); //重载=
		operator double(){return double(numerator/denominator);}//重载double()
		friend ostream& operator << (ostream& ost,const Fraction& e);//重载<<
	private:
		int numerator; //分子
		int denominator; //分母
};

//重载+
const Fraction Fraction::operator + (const Fraction& c)
{
	int aa = numerator + c.numerator ;
	int bb = denominator + c.denominator;
	return Fraction(aa,bb);
}

//重载=
Fraction Fraction::operator = (const Fraction& d)
{
	int nn = d.numerator;
	int dd = d.denominator;
	return Fraction(nn,dd);
}

ostream& operator << (ostream& ost,const Fraction& e)
{
	ost << e.numerator << "/" <<e.denominator  << endl;
	return ost; 
}