第九周实验报告（2）

/* 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
* Copyright (c) 2012, 烟台大学计算机学院学生
* All rights reserved.
* 文件名称：                        
* 作    者：        李瑞                  
* 完成日期：  2012 年4 月 15日
* 版 本 号：        v1.0
* 对任务及求解方法的描述部分
* 输入描述：……
* 问题描述：……
* 程序输出：……
* 程序头部的注释结束*/

#include <iostream>     using namespace std;    class CTime  {  private:      unsigned short int hour;    // 时       unsigned short int minute;  // 分       unsigned short int second;  // 秒       friend bool is_time(int, int, int);   public:      CTime(int h = 0, int m = 0, int s = 0):hour(h), minute(m), second(s){}      void setTime(int h, int m, int s);      //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       friend ostream & operator << (ostream&, CTime&);      friend istream & operator >> (istream&, CTime&);  };  //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;  }    ostream &operator << (ostream &output, CTime &c)  {      output << c.hour << ":" << c.minute << ":"  << c.second << endl;        return output;  }    bool is_time(int h, int m, int s)    {        if(h < 0 || h > 24 || m < 0 ||m > 60 || s < 0 || s > 60)        {          return false;      }      else      {          return true;       }  }      istream &operator >> (istream &input, CTime &c)  {      char c1,c2;         cout << "请输入时间(格式hh:mm:ss)" << endl;          while(1)        {            cin >> c.hour >> c1 >> c.minute >> c2 >> c.second;            if(c1 != ':' || c2 != ':')            {              cout << "格式不正确，请重新输入"<<endl;            }          else if(!is_time(c.hour, c.minute, c.second))            {              cout << "时间非法，请重新输入"  << endl;            }          else            {              break;            }        }      return input;  }      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 != t.hour || minute != t.minute || second != t.second)      {          return true;      }        else      {          return false;      }  }      CTime CTime::operator + (CTime &c)  {      CTime c2;      int time;        time = (hour * 3600 + minute * 60 + second) + (c.hour * 3600 + c.minute * 60 + c.second);        c2.hour = time / 3600;        time = time % 3600;        c2.minute = time / 60;        time = time % 60;        c2.second = time;        return c2;  }  CTime CTime::operator - (CTime &c)  {      CTime c2;      int time, t1, t2;        t1 = hour * 3600 + minute * 60 + second;        t2 = c.hour * 3600 + c.minute * 60 + c.second;        if(t1 > t2)      {          time = t1 -t2;      }        else      {          time = t2 - t1;      }        c2.hour = time / 3600;        time = time % 3600;        c2.minute = time / 60;        time = time % 60;        c2.second = time;        return c2;  }    CTime CTime::operator + (int s)  {      int time = hour * 3600 + minute * 60 + second + s;        hour = time / 3600;        time = time % 3600;        minute = time / 60;        time = time % 60;        second = time;          return (*this);  }      CTime CTime::operator - (int s)  {      int time = hour * 3600 + minute * 60 + second;        time = time - s;        hour = time / 3600;        time = time % 3600;        minute = time / 60;        time = time % 60;        second = time;        return (*this);  }    CTime CTime::operator ++ (int)   {      CTime temp = (*this);        int time = hour * 3600 + minute * 60 + second + 1;        hour = time / 3600;        time = time % 3600;        minute = time / 60;        time = time % 60;        second = time;        return temp;  }    CTime CTime::operator ++ ()  {      int time = hour * 3600 + minute * 60 + second +1;        hour = time / 3600;        time = time % 3600;        minute = time / 60;        time = time % 60;        second = time;        return (*this);  }  CTime CTime::operator -- (int)  {      CTime temp = (*this);        (*this) = (*this) - 1;        return temp;  }  CTime CTime::operator -- ()  {      (*this) = (*this) - 1;        return (*this);  }    CTime CTime::operator += (CTime &c)  {      (*this)= (*this) + c;        return (*this);  }  CTime CTime::operator -= (CTime &c)  {      (*this) = (*this) - c;        return (*this);  }  CTime CTime::operator += (int s)  {      CTime c2;        c2 = (*this) + s;        return c2;  }  CTime CTime::operator -= (int s)  {      CTime c2;        c2 = (*this) - s;        return c2;  }    void main()  {      CTime t1, t2, t;        cin >> t1 >> t2;        cout << "t1为：" << t1;        cout << "t2为：" << t2;        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;        t = t1 + t2;        cout << "t1 + t2 =" << t;        t = t2 - t1;        cout << "t2 - t1 =" << t;        t = t1;        t = t + 40;        cout << "t1 + 40s =" << t;        t = t2;        t = t - 10;        cout << "t2 - 10s =" << t;        t = t1++;        cout << "t1++ =" << t;        t = --t2;        cout << "--t2 =" << t;        t = t1;        t += t2;        cout << "t1 = t1 + t2 , t1 = " << t;        t = t1;        t -= 5;        cout << "t1 = t1 - 5, t1 = " << t;        system("pause");  }  

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