第九周实验报告（任务2）

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： 时间类运算符重载  
* 作    者：     郭广建                       
* 完成日期：  2012年    04  月  22    日
* 版 本 号：  1.0

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);//输入、输出符重载friend istream& operator>>(istream &input,CTime &t);friend ostream& operator<<(ostream &output,CTime &t);    //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};istream& operator>>(istream &input,CTime &t){char c, d;while(1){cout << "请按hh:mm:ss的格式输入时间" <<endl;    input >> t.hour >> c >>t.minute >> d >>t.second ;    if(t.hour > 24 || t.minute > 60|| t.second > 60){    continue;}if(c != ':' || d != ':'){continue;}else break;}return input;}ostream& operator<<(ostream &output,CTime &t){output << t.hour << ':' <<t.minute << ':' << t.second;return output;}CTime::CTime(int h,int m,int s){hour = h;minute = m;second = s;}void CTime::setTime(int h,int m,int s){hour = h;minute = m;second = s;}bool CTime::operator > (CTime &t){if(hour > t.hour)  return true;    if(minute > t.minute) return true;if(second > t.second) return true;return false;}bool CTime::operator < (CTime &t){if(hour < t.hour)  return true;    if(minute < t.minute) return true;if(second < t.second) return true;return false;}bool CTime::operator >= (CTime &t){if(hour < t.hour)  return false;    if(minute < t.minute) return false;if(second < t.second) return false;return true;}bool CTime::operator <= (CTime &t){if(hour > t.hour)  return false;    if(minute > t.minute) return false;if(second > t.second) return false;return true;}bool CTime::operator == (CTime &t){return(hour==t.hour?true:false && minute==t.minute?true:false &&second==t.second?true:false);}bool CTime::operator != (CTime &t){return(hour!=t.hour?true:false || minute!=t.minute?true:false ||second!=t.second?true:false);}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 s1, s2, s;s1 = hour *3600 + minute * 60 + second;s2 = c.hour*3600 + c.minute *60 + c.second;s = s1 + s2;if(s > 24*3600){s -= 24*3600;}return CTime(s/3600, (s%3600)/60, (s%3600)%60);}CTime CTime::operator-(CTime &c)//对照+理解{int s1, s2, s;s1 = hour *3600 + minute * 60 + second;s2 = c.hour*3600 + c.minute *60 + c.second;s = s1 - s2;if(s < 0){s += 24*3600;}return CTime(s/3600, (s%3600)/60, (s%3600)%60);}CTime CTime::operator+(int s)//返回s秒后的时间{int s1, s2;s1 = hour *3600 + minute * 60 + second;s2 = s1 + s;return CTime(s2/3600, (s2%3600)/60, (s2%3600)%60);}CTime CTime::operator-(int s)//返回s秒前的时间{int s1, s2;s1 = hour *3600 + minute * 60 + second;s2 = s1 - s;if(s2 < 0){s += 24*3600;}return CTime(s2/3600, (s2%3600)/60, (s2%3600)%60);}CTime CTime::operator++(int)//后置++，下一秒{CTime temp(*this);second++;if(second >= 60){second = 0;++minute;}return temp;}CTime CTime::operator++()//前置++，下一秒{    if(++second >= 60){second = 0;++minute;}return *this;}CTime CTime::operator--(int)//后置--，前一秒{CTime temp(*this);second--;if(second <= 60){second = 60;--minute;}return temp;}CTime CTime::operator--()//前置--，前一秒{    if(--second <= 0){second = 60;--minute;}return *this;}CTime CTime::operator+=(CTime &c){int s1, s2, s;s1 = hour *3600 + minute * 60 + second;s2 = c.hour*3600 + c.minute *60 + c.second;s = s1 + s2;hour = s/3600;minute = (s%3600)/60;second = (s%3600)%60;return (hour, minute, second);}CTime CTime::operator-=(CTime &c){int s1, s2, s;s1 = hour *3600 + minute * 60 + second;s2 = c.hour*3600 + c.minute *60 + c.second;s = s1 - s2;if(s < 0){s += 24*3600;}hour = s/3600;minute = (s%3600)/60;second = (s%3600)%60;return (hour, minute, second);}CTime CTime::operator+=(int s)//返回s秒后的时间{int s1, s2;s1 = hour *3600 + minute * 60 + second;s2 = s1 + s;hour = s2/3600;minute = (s2%3600)/60;second = (s2%3600)%60;return (hour, minute, second);}CTime CTime::operator-=(int s)//返回s秒前的时间{int s1, s2;s1 = hour *3600 + minute * 60 + second;s2 = s1 - s;if(s2 < 0){s2 += 24*3600;}hour = s2/3600;minute = (s2%3600)/60;second = (s2%3600)%60;return (hour, minute, second);}void main(){    CTime t1,t2,t;cin >>t1 >> t2;    cout<<"t1为：";    cout << t1;    cout<<"t2为：";    cout << 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;    //下面自行设计对其他运算符的重载的测试    t = t1 + t2;cout << "t1+t2 = ";cout << t <<endl;t = t1 - t2;cout << "t1-t2 = ";cout << t <<endl;t = t1 + 500;cout << "t1+500 = ";cout << t <<endl;t = t1 - 500;cout << "t1-500 = ";cout << t <<endl;++t1;cout << "++t1 = ";cout << t <<endl;--t1;cout<< "--t1 = ";cout << t <<endl;t1 += t2;cout << "t1+=t2 = ";cout << t <<endl;t1 -= t2;cout << "t1-=t2 = ";cout << t <<endl;t2 += 500;cout <<"t2+=500 = ";cout << t <<endl;t2 -= 500;cout << "t2-=500 = ";cout << t <<endl;    system("pause");}

运行结果：

 

知识积累： 综合到任务3