8.2 Time 的运算符重载

* 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：      第八周 任务二                       
* 作    者：          杨森                   
* 完成日期：      2012   年    4   月    10    日
* 版 本 号：      V1.0

源程序：

#include <iostream>   using namespace std;  class CTime  {  private:      unsigned short int hour;    // 时       unsigned short int minute;  // 分       unsigned short int second;  // 秒   public:      CTime(int h=0,int m=0,int s=0);      void setTime(int h,int m,int s);      void display();      //比较运算符(二目)的重载       bool operator > (CTime &t);      bool operator < (CTime &t);      bool operator >= (CTime &t);      bool operator <= (CTime &t);      bool operator == (CTime &t);      bool operator != (CTime &t);      //二目运算符的重载       CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15       CTime operator-(CTime &c);//对照+理解       CTime operator+(int s);//返回s秒后的时间       CTime operator-(int s);//返回s秒前的时间       //一目运算符的重载       CTime operator++(int);//后置++，下一秒       CTime operator++();//前置++，下一秒       CTime operator--(int);//后置--，前一秒       CTime operator--();//前置--，前一秒       //赋值运算符的重载            CTime operator+=(CTime &c);      CTime operator-=(CTime &c);      CTime operator+=(int s);//返回s秒后的时间       CTime operator-=(int s);//返回s秒前的时间   };  //下面实现所有的运算符重载代码。   //为简化编程，请注意通过调用已有函数，利用好各函数之间的关系   void CTime::setTime(int h,int m,int s)  {      hour = h;      minute = m;      second = s;  }    CTime::CTime(int h,int m,int s)  {      hour = h;      minute = m;      second = s;  }      void CTime::display()  {      cout << hour << ":" << minute << ":" << second << endl;  }        //比较运算符(二目)的重载   bool CTime::operator > (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) > (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }    bool CTime::operator < (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) < (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }    bool CTime::operator >= (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) >= (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }    bool CTime::operator <= (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) <= (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }    bool CTime::operator == (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) == (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }    bool CTime::operator != (CTime &t)  {      if( (hour * 3600 + minute * 60 + second) != (t.hour * 3600 + t.minute * 60 + t.second ))      {          return true;      }      else      {          return false;      }  }      //二目运算符的重载   CTime CTime::operator+(CTime &c)//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15   {  int a,b, e, d;      CTime t;      a = hour * 3600 + minute * 60 + second;      b = c.hour * 3600 + c.minute * 60 + c.second;      e = a + b;      t.hour = e / 3600;      d = e % 3600;      t.minute = d / 60;      t.second = d % 60;      if( t.hour > 12 )      {          t.hour -= 12;      }      return t;  }    CTime CTime::operator-(CTime &c)//对照+理解   {      int a,b, e, d;      CTime t;      a = hour * 3600 + minute * 60 + second;      b = c.hour * 3600 + c.minute * 60 + c.second;      e = a - b;      t.hour = e / 3600;      d = e % 3600;      t.minute = d / 60;      t.second = d % 60;      if( t.hour > 12 )      {          t.hour -= 12;      }      return t;  }    CTime CTime::operator+(int s)//返回s秒后的时间   {      int a, c, d;      CTime t;      a = hour * 3600 + minute * 60 + second;      c = a + s;      t.hour = c / 3600;      d = c % 3600;      t.minute = d / 60;      t.second = d % 60;      if( t.hour > 12 )      {          t.hour -= 12;      }      return t;  }    CTime CTime::operator-(int s)//返回s秒前的时间   {  int a, c, d;      CTime t;      a = hour * 3600 + minute * 60 + second;      c = a - s;      t.hour = c / 3600;      d = c % 3600;      t.minute = d / 60;      t.second = d % 60;      if( t.hour > 12 )      {          t.hour -= 12;      }      return t;  }        //一目运算符的重载   CTime CTime::operator++(int)//后置++，下一秒   {      CTime t(*this);      second++;      if( second >= 60)      {          second -= 60;          ++minute;          if( minute >= 60)          {              minute -= 60;              ++hour;              if( hour >= 12)              {                  hour -= 12;              }          }      }      return t;  }    CTime CTime::operator++()//前置++，下一秒   {            if( ++second >= 60)      {          second -= 60;          ++minute;          if( minute >= 60)          {              minute -= 60;              ++hour;              if( hour >= 12)              {                  hour -= 12;              }          }      }      return *this;  }    CTime CTime::operator--(int)//后置--，前一秒   {      CTime t(*this);      second--;      if( second < 0)      {          second = 59;          --minute;          if( minute < 0)          {              minute = 59;              --hour;              if( hour < 0)              {                  hour = 11;              }          }      }      return t;  }  CTime CTime::operator--()//前置--，前一秒   {      if( --second < 0)      {          second = 59;          --minute;          if( minute < 0)          {              minute = 59;              --hour;              if( hour < 0)              {                  hour = 11;              }          }      }      return (*this);  }        //赋值运算符的重载        CTime CTime::operator+=(CTime &c)  {       int a,b, e, d;            a = hour * 3600 + minute * 60 + second;      b = c.hour * 3600 + c.minute * 60 + c.second;      e = a + b;      hour = e / 3600;      d = e % 3600;      minute = d / 60;      second = d % 60;      if( hour > 12 )      {          hour -= 12;      }      return (*this);  }    CTime CTime::operator-=(CTime &c)  {      int a,b, e, d;      //CTime t;       a = hour * 3600 + minute * 60 + second;      b = c.hour * 3600 + c.minute * 60 + c.second;      e = a - b;      hour = e / 3600;      d = e % 3600;      minute = d / 60;      second = d % 60;      if( hour > 12 )      {          hour -= 12;      }      return (*this);  }    CTime CTime::operator+=(int s)//返回s秒后的时间   {            unsigned short int a, c, d;      //CTime t;       a = hour * 3600 + minute * 60 + second;      c = a + s;      hour = c / 3600;      d = c % 3600;      minute = d / 60;      second = d % 60;      if( hour > 12 )      {          hour -= 12;      }      return (*this);  }  CTime CTime::operator-=(int s)//返回s秒前的时间   {      int a, c, d;      //CTime t;       a = hour * 3600 + minute * 60 + second;      c = a - s;      hour = c / 3600;      d = c % 3600;      minute = d / 60;      second = d % 60;      if( hour > 12 )      {          hour -= 12;      }      return (*this);  }      void main()  {      CTime t1(8,20,25),t2(11,20,50),t;      cout<<"t1为：";      t1.display();      cout<<"t2为：";      t2.display();      cout<<"下面比较两个时间大小：\n";      if (t1>t2) cout<<"t1>t2"<<endl;      if (t1<t2) cout<<"t1<t2"<<endl;      if (t1==t2) cout<<"t1＝t2"<<endl;       if (t1!=t2) cout<<"t1≠t2"<<endl;      if (t1>=t2) cout<<"t1≥t2"<<endl;      if (t1<=t2) cout<<"t1≤t2"<<endl;      cout<<endl;      //下面自行设计对其他运算符的重载的测试       t = t1 + t2;      cout << "t1+t2 = ";      t.display();      t = t2 - t1;      cout << "t2-t1 = ";      t.display();      t = t1 + 30;      cout << "t1+30= ";      t.display();      t = t2 - 30;      cout <<"t2-30 = ";      t.display(); cout<<endl;    t = ++ t1;      cout << "++t1 = ";      t.display ();      cout << "t1 = ";      t1.display ();t = t1++;      cout << "t1++ = ";      t.display ();      cout << "t1 = ";      t1.display ();    t = -- t1;      cout << "--t1 = ";      t.display ();      cout << "t1 = ";      t1.display ();      t = t1--;      cout << "t1-- = ";      t.display ();     cout<<endl;    cout<<"t1为：";      t1.display();      cout<<"t2为：";      t2.display();      t2 -= t1;      cout << "(t2-=t1) = ";      t2.display ();      cout<<"t1为：";      t1.display();      cout<<"t2为：";      t2.display();      t = t2;      t += t1;      cout << "(t2+=t1) = ";      t.display ();      system("pause");  }  

运行结果：

 

小感：真的好长啊~