C++程序设计实验报告（五十九）---第九周任务3

/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2012, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：流运算符重载运算符（分数类）

* 作 者： 刘镇
* 完成日期： 2012 年 4 月 15 日
* 版 本 号： 1.055
* 对任务及求解方法的描述部分
* 输入描述： 分数

* 问题描述： 分数流运算符重载

* 程序输出： ......

* 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   int gcd(int nu, int de);  public:  //重载流运算符friend istream & operator >> (istream &, CFraction &);friend ostream & operator << (ostream &, CFraction &);//构造函数及运算符重载的函数声明   CFraction(int nu = 0, int de = 1):nume(nu), deno(de){};         //构造函数，初始化用    friend CFraction operator + (CFraction c1,CFraction c2);  friend CFraction operator - (CFraction c1,CFraction c2);  friend CFraction operator * (CFraction c1,CFraction c2);  friend CFraction operator / (CFraction c1,CFraction c2);  friend CFraction operator - (CFraction c);  friend CFraction operator + (CFraction c, int s);  friend CFraction operator - (CFraction c, int s);  friend CFraction operator * (CFraction c, int s);  friend CFraction operator / (CFraction c, int s);  friend CFraction operator + (int s, CFraction c);  friend CFraction operator - (int s, CFraction c);  friend CFraction operator * (int s, CFraction c);  friend CFraction operator / (int s, CFraction c);  bool operator > (CFraction &t);  bool operator < (CFraction &t);  bool operator >= (CFraction &t);  bool operator <= (CFraction &t);  bool operator == (CFraction &t);  bool operator != (CFraction &t);  void Simplify();                    //化简（使分子分母没有公因子）   void display();  };  //重载流插入运算符istream & operator >> (istream & in, CFraction & c){char c1;cout << "请输入分数值：(形式:nume / deno)" << endl;while(1){in >> c.nume >> c1 >> c.deno;if(c1 != '/'){cout << "格式不正确！请重新输入：" << endl;}else if(c.deno == 0){cout << "分母非法！重新输入：" << endl;}else{break;}}return in;}//重载流提取运算符ostream & operator << (ostream & out, CFraction & c){out << c.nume << "/" << c.deno << endl;return out;}//重载函数的实现及用于测试的main()函数   void CFraction::Simplify()   {    int n ;  if(nume < 0)  {  n = gcd(-nume, deno);  }  else  {  n = gcd(nume, deno);  }  nume = nume / n;    deno = deno / n;   }    int CFraction::gcd(int nu, int de)      {      int t, r, a, b;     a = nu;    b = de;    if (a < b)         {      t = a;      a = b;                                       b = t;      }       while (b != 0)      {      r = a % b;      a = b;      b = r;      }      return a;      }    void CFraction::display()  {  cout << nume << "/" << deno << endl;  }  CFraction operator + (CFraction c1,CFraction c2)  {  CFraction c;  c.nume = c1.nume * c2.deno + c2.nume * c1.deno;  c.deno = c1.deno * c2.deno;  return c;  }  CFraction operator - (CFraction c1,CFraction c2)  {  CFraction c;  c.nume = c1.nume * c2.deno - c2.nume * c1.deno;  c.deno = c1.deno * c2.deno;  return c;  }  CFraction operator * (CFraction c1,CFraction c2)  {  CFraction c;  c.nume = c1.nume * c2.nume;  c.deno = c1.deno * c2.deno;  return c;  }  CFraction operator / (CFraction c1,CFraction c2)  {  CFraction c;  c.nume = c1.nume * c2.deno;  c.deno = c1.deno * c2.nume;  return c;  }  CFraction operator - (CFraction c)  {  c.nume = 0 - c.nume;  return c;  }  bool CFraction::operator > (CFraction &t)  {  if(nume * t.deno > t.nume * deno)  {  return true;  }  else  {  return false;  }  }  bool CFraction::operator < (CFraction &t)  {  if(nume * t.deno < t.nume * deno)  {  return true;  }  else  {  return false;  }  }  bool CFraction::operator >= (CFraction &t)  {  if(nume * t.deno >= t.nume * deno)  {  return true;  }  else  {  return false;  }  }  bool CFraction::operator <= (CFraction &t)  {  if(nume * t.deno <= t.nume * deno)  {  return true;  }  else  {  return false;  }  }  bool CFraction::operator == (CFraction &t)  {  if(nume * t.deno == t.nume * deno)  {  return true;  }  else  {  return false;  }  }  bool CFraction::operator != (CFraction &t)  {  if(nume * t.deno != t.nume * deno)  {  return true;  }  else  {  return false;  }  }  CFraction operator + (CFraction c, int s)  {  CFraction c2 = c;  c2.nume = c.nume + s * c.deno;  return c2;  }  CFraction operator - (CFraction c, int s)  {  CFraction c2 = c;  c2.nume = c.nume - s * c.deno;  return c2;  }  CFraction operator * (CFraction c, int s)  {  CFraction c2 = c;  c2.nume = c.nume * s;  return c2;  }  CFraction operator / (CFraction c, int s)  {  CFraction c2 = c;  c2.deno = c.deno * s;  return c2;  }  CFraction operator + (int s, CFraction c)  {  CFraction c2 = c;  c2.nume = c.nume + s * c.deno;  return c2;  }  CFraction operator - (int s, CFraction c)  {  CFraction c2 = c;  c2.nume = s * c.deno - c.nume;  return c2;  }  CFraction operator * (int s, CFraction c)  {  CFraction c2 = c;  c2.nume = s * c.nume;  return c2;  }  CFraction operator / (int s, CFraction c)  {  CFraction c2 = c;  c2.nume = s * c.deno;  c2.deno = c.nume;  return c2;  }  void main()  {  CFraction c1(3, 5), c2(2, 3), c;   cin >> c1 >> c2;c1.Simplify(); c2.Simplify(); cout << "c1 =" << c1;cout << "c2 =" << c2;c = c1 + c2;  c.Simplify();  cout << "c1 + c2 =" << c;c = c1 - c2;  c.Simplify();  cout << "c1 - c2 =" << c;c = c1 * c2;  c.Simplify();  cout << "c1 * c2 =" << c;c = c1 / c2; c.Simplify();  cout << "c1 / c2 =" << c;c = c1 + 2; c.Simplify(); cout << "c1 + 2 =" << c;  c = 2 - c2;  c.Simplify();  cout << "2 - c2 =" << c;  c = c1 * 2;   c.Simplify();  cout << "c1 * 2 =" << c; c = 2 / c2;  c.Simplify();  cout << "2 / c2 =" << c;c = - c1;  cout << "-c1 =" << c;  if(c1 > c2)  {  cout << "c1 > c2" << endl;  }  if(c1 < c2)  {  cout << "c1 < c2" << endl;  }  if(c1 >= c2)  {  cout << "c1 ≥ c2" << endl;  }  if(c1 <= c2)  {  cout << "c1 ≤ c2" << endl;  }  if(c1 == c2)  {  cout << "c1 = c2" << endl;  }  if(c1 != c2)  {  cout << "c1 ≠ c2" << endl;  }  system("pause");  }  

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