重载函数实现时间类
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/** 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 rightsreserved.* 文件名称: object.cpp* 作者:赵 洋* 完成日期: 2013年4 月26 日* 版本号: v1.0* 输入描述:无* 问题描述:通过重载运算符实现时间处理* 程序输出:*/#include <iostream>using namespace std;class CTime{private:int hour; // 时int minute; // 分int second; // 秒public://CTime(int h=0,int m=0,int s=0);//void setTime(int h,int m,int s);friend ostream&operator<<(ostream&,CTime&);friend istream&operator>>(istream&,CTime&);//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:41:15CTime 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,前置与后置返回值不一样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);CTime operator-=(int s);};//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ostream&operator<<(ostream&output,CTime&t){ output<<t.hour<<":"<<t.minute<<":"<<t.second<<endl; return output;}istream&operator>>(istream&input,CTime&t){ int a,b,c; char sign; do { input>>a>>sign>>b>>sign>>c; }while(!(sign==':'));t.hour=a;t.minute=b;t.second=c;return input;}bool CTime::operator > (CTime &t){ if(hour*3600+minute*60+second >t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator < (CTime &t){ if(hour*3600+minute*60+second <t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator >= (CTime &t){ if(hour*3600+minute*60+second >=t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator <= (CTime &t){ if(hour*3600+minute*60+second <=t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator == (CTime &t){ if(hour==t.hour&&minute==t.minute&&second==t.second){return true;}elsereturn false;}bool CTime::operator != (CTime &t){ if(hour!=t.hour&&minute!=t.minute&&second!=t.second){return true;}elsereturn false;}CTime CTime::operator+(CTime &c){ CTime t1;int time;time = hour*3600+minute*60+second+(c.hour*3600+c.minute*60+c.second);t1.hour=time/3600;if(t1.hour>=24) { t1.hour-=24; }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator-(CTime &c){ CTime t1;int time;time = hour*3600+minute*60+second-(c.hour*3600+c.minute*60+c.second);if(time<0){time = -time;}t1.hour=time/3600;if(t1.hour>=24) { t1.hour-=24; }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator+(int s){ CTime t1; int time; time=hour*3600+minute*60+second+s; t1.hour=time/3600; if(t1.hour>=24) { t1.hour-=24; }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator-(int s){ CTime t1; int time; time=hour*3600+minute*60+second-s; t1.hour=time/3600; if(t1.hour>=24) { t1.hour-=24; }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator++( int){while(second>=60){second-=60;++minute;}while(minute>=60){minute-=60;++hour;}while(hour>23){hour-=24;}return *this;//返回的对象为改之前的,但实际对象已经改变}CTime CTime::operator++( ){ if(++second>=60) { second-=60; ++minute; } if(minute>=60) { minute-=60; ++hour; } if(hour>=24) { hour-=24; } return *this;}CTime CTime::operator--( int){second--;while(second<=0){second+=60;--minute;}while(minute<=0){minute+=60;--hour;}while(hour<0){hour+=24;}return *this;//返回的对象为改之前的,但实际对象已经改变}CTime CTime::operator--( ){ if(--second<=0) { second+=60; --minute; } if(minute<=0) { minute+=60; --hour; } if(hour<=0) { hour+=23; } return *this;}CTime CTime::operator+=(CTime &c){int time;time = hour*3600+minute*60+second+(c.hour*3600+c.minute*60+c.second);hour=time/3600;time =time%3600;minute =time/60;time = time%60;second =time;return *this;}CTime CTime::operator-=(CTime &c){int time;time = hour*3600+minute*60+second-(c.hour*3600+c.minute*60+c.second);if(time<0){time=-time;}hour=time/3600;while(hour>=24){hour-=24;}time =time%3600;minute =time/60;time = time%60;second =time;return *this;}CTime CTime::operator+=(int s){second+=s;while(second>=60){second-=60;++minute;}while(minute>=60){minute-=60;++hour;}while(hour>=24){hour-=24;}return *this;}CTime CTime::operator-=(int s){ int time; time=hour*3600+minute*60+second-s; if(time<0) { time=(-time); } hour=time/3600; if(hour>=24) { hour-=24; }time =time%3600;minute =time/60;time = time%60;second =time;return *this;}int main(){CTime t1,t2,t;cin>>t1>>t2;cout<<"t1为:"<<t1<<endl;cout<<"t2为:"<<t2<<endl;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<<endl;t = t1-t2;cout<<"t1-t2 ="<<t<<endl;t = t1+15;cout<<"t1+15s ="<<t<<endl;t = t1-15;cout<<"t1-15s ="<<t<<endl;t = t1++;cout<<"t1++ ="<<t<<endl;t = ++t1;cout<<"++t1 ="<<t<<endl;t = t1--;cout<<"t1--="<<t<<endl;t = --t1;cout<<"--t1 ="<<t<<endl;t1+=t2;cout<<"t1+=t2="<<t<<endl;t1-=t2;cout<<"t1-=t2="<<t<<endl;t1 +=24;cout<<"t1+=24s="<<t<<endl;t1-=55;cout<<"t1-=55s="<<t<<endl;}
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