8-3 实现分数类中的运算符重载

/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称： 分数类中的运算符重载
* 作 者： 张传新
* 完成日期： 2012 年 04 月 08 日
* 版 本 号： V.1.0

* 对任务及求解方法的描述部分
* 问题描述：实现分数类中的运算符重载，在分数类中可以完成分数的

* 加减乘除（运算后再化简）、求反、比较（6种关系）的运算。

* 程序头部的注释结束

#include<iostream>using namespace std;class CFraction{private:int nume;  // 分子int deno;  // 分母public:CFraction(int nu = 1,int de = 2);   //构造函数，初始化用void input();                   //按照"nu/de"的格式，如"5/2"的形式输入void Simplify();    //化简（使分子分母没有公因子）void S_Simplify();              //化简（以4/3为例,输出1(1/3)，表示一又三分之一）void output(int style);    //输出：以8/6为例，style为0时，输出8/6；        //style为1时，输出4/3；        //style为2时，输出1(1/3)，表示一又三分之一；        //不给出参数和非1、2，认为是方式0void display();                 //输出分数CFraction operator+(CFraction &CF2); //定义分数加法CFraction operator-(CFraction &CF2); //定义分数减法CFraction operator*(CFraction &CF2); //定义分数乘法CFraction operator/(CFraction &CF2); //定义分数除法CFraction operator-();//取反//比较大小bool operator > (CFraction &CF2);bool operator < (CFraction &CF2);bool operator >= (CFraction &CF2);bool operator <= (CFraction &CF2);bool operator == (CFraction &CF2);bool operator != (CFraction &CF2);};//构造函数，初始化用CFraction::CFraction(int nu,int de){nume = nu;deno = de;}//输出分数void CFraction::display(){cout << nume << "/" << deno <<endl;}//按照"nu/de"的格式，如"5/2"的形式输入void CFraction::input(){int a,c;char b;cout << "请输入分数（按照“a/b”的格式输入）：" << endl;cin >> a;cin >> b;cin >> c;nume = a;deno = c;}//化简（使分子分母没有公因子）void CFraction::Simplify(){for(int i = 2;i <= nume && i <= deno;i++){if(nume % i == 0 && deno % i == 0){nume = nume/i;deno = deno/i;    i--;}}cout << nume << "/" << deno << endl;}//化简（以4/3为例,输出1(1/3)，表示一又三分之一）void CFraction::S_Simplify(){for(int i = 2;i <= nume && i <= deno;i++){if(nume % i == 0 && deno % i == 0){nume = nume/i;deno = deno/i;i--;}}    if(nume >= deno){int n;        n = nume / deno;nume = nume % deno;    cout << n << "(" << nume << "/" << deno << ")" << endl;}else{cout << "(" << nume << "/" << deno << ")" << endl;}}//输出：以8/6为例，style为0时，输出8/6；//style为1时，输出4/3；//style为2时，输出1(1/3)，表示一又三分之一；//不给出参数和非1、2，认为是方式0void CFraction::output(int style){if(style == 1){CFraction::Simplify();}else if(style == 2){CFraction::S_Simplify();}else{cout << nume << "/" << deno << endl;}}//定义分数加法CFraction CFraction::operator+(CFraction &CF2){nume = nume * CF2.deno + CF2.nume * deno;deno = deno * CF2.deno;return (*this);}//定义分数减法CFraction CFraction::operator-(CFraction &CF2){nume = nume * CF2.deno - CF2.nume * deno;deno = deno * CF2.deno;return (*this);}//定义分数乘法CFraction CFraction::operator*(CFraction &CF2){nume = nume * CF2.nume;deno = deno * CF2.deno;return (*this);}//定义分数除法CFraction CFraction::operator/(CFraction &CF2){nume = nume * CF2.deno;deno = deno * CF2.nume;return (*this);}//取反CFraction CFraction::operator-(){nume = - nume;deno = deno;return (*this);}//比较大小bool CFraction::operator > (CFraction &CF2)   {  nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  > CF2.nume )      {          return true;      }      else      {          return false;      }  }  bool CFraction::operator < (CFraction &CF2)   {      nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  < CF2.nume )      {          return true;      }      else      {          return false;      }  }  bool CFraction::operator >= (CFraction &CF2)   {      nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  >= CF2.nume )     {          return true;      }       else      {          return false;      }  }  bool CFraction::operator <= (CFraction &CF2)   {      nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  <= CF2.nume )     {          return true;      }      else      {          return false;      }  }  bool CFraction::operator == (CFraction &CF2)   {      nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  == CF2.nume )     {          return true;      }        else      {          return false;      }  }  bool CFraction::operator != (CFraction &CF2)   {      nume = nume * CF2.deno;CF2.nume = CF2.nume * deno;    if( nume  != CF2.nume )     {          return true;      }       else      {          return false;      }  }  void main(){CFraction CF1, CF2;CF1.input();         CF1.output(1);CF2.input(); CF2.output(2);cout << endl;CFraction CF3(3,4), CF4(1,4),CF5;cout << "CF3为：" ; CF3.display();cout << "CF4为：" ; CF4.display();    CF5 = CF3;CF5 = CF5 + CF4;cout << "CF3 + CF4 = ";CF5.display();cout << "化简后得：";CF5.Simplify();CF5 = CF3;CF5 = CF5 - CF4;cout << "CF3 - CF4 = ";CF5.display();cout << "化简后得：";CF5.Simplify();CF5 = CF3;CF5 = CF5 * CF4;cout << "CF3 * CF4 = ";CF5.display();cout << "化简后得：";CF5.Simplify();CF5 = CF3;CF5 = CF5 / CF4;cout << "CF3 / CF4 = ";CF5.display();cout << "化简后得：";CF5.Simplify();CF5 = CF3;CF5 = - CF5;cout << "-CF3 = ";CF5.display();cout << "比较两个分数大小：" << endl;          if (CF3 > CF4) cout << "CF3 > CF4" << endl;if (CF3 < CF4) cout << "CF3 < CF4" << endl;if (CF3 >= CF4) cout << "CF3 >= CF4" << endl;if (CF3 <= CF4) cout << "CF3 <= CF4" << endl;if (CF3 == CF4) cout << "CF3 == CF4" << endl;if (CF3 != CF4) cout << "CF3 != CF4" << endl;system("pause");}

运行结果：

感言：

昨晚第二个感觉第三个比较轻松一些，同时在做第三个任务的时候，

想到第二个任务中有些漏洞，并及时的改正过来了，感觉。。。。

挺好！