用运算符重载实现分数的加减乘除（c++实现）

此程序运用c++程序中的运算符重载来做。

text.cpp
#include<iostream>
#include<iomanip>
#include"Score.h"
using namespace std;
int main()
{
	Score a,b,c;
	cout <<"输入三个分数" <<endl;
	cin>>a;
	cin>>b;
	cin>>c;
	a=a+b;
	cout<<"a=a+b的值为：";
	cout <<a<<endl;
	a=a-b;
	cout <<"a=a-b的值为："; 
	cout <<a<<endl;
	cout <<"b=b*c的值为："; 
	b=c*b;
	cout <<b<<endl;
	cout <<"a=a/c的值为："; 
	a=a/c;
	cout <<a<<endl;
}

Srore.h
#include<iostream>
#ifndef SCORE_H
#define SCORE_H
using namespace std; 
class Score
{
	friend ostream & operator<<(ostream&,     const Score &);
	friend istream & operator>>(istream&,     Score &);
	friend	Score operator+(Score x,Score y);
	friend	Score operator-(Score x,Score y);
	friend	Score operator*(Score x,Score y);
	friend	Score operator/(Score x,Score y);
	public:
		Score(int m=0,int d=0);
		~Score();
	private: 
	int mole;
	int de