Time类

/*
* 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： 1.cpp
* 作者：庄子豪
* 完成日期： 2013年 5 月 07 日
* 版本号：
* 输入描述：
* 问题描述：
* 程序输出：
*/

#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:41:15CTime operator-(CTime &c);//对照+理解CTime operator+(int s);      //返回s秒后的时间CTime operator-(int t);     //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);friend istream& operator>>(istream&,CTime&);    friend ostream& operator<<(ostream&,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;}void CTime::display(){    cout<<hour<<":"<<minute<<":"<<second<<endl;}bool CTime::operator > (CTime &t){    if(hour>t.hour)    {        return true;    }    else if(minute>t.minute)    {        return true;    }    else if(second>t.second)    {        return true;    }    else    {        return false;    }}bool CTime::operator < (CTime &t){    if(hour<t.hour)    {        return true;    }    else if(minute<t.minute)    {        return true;    }    else if(second<t.second)    {        return true;    }    else    {        return false;    }}bool CTime::operator >= (CTime &t){    if(hour>=t.hour)    {        return true;    }    else if(minute>=t.minute)    {        return true;    }    else if(second>=t.second)    {        return true;    }    else    {        return false;    }}bool CTime::operator <= (CTime &t){    if(hour<=t.hour)    {        return true;    }    else if(minute<=t.minute)    {        return true;    }    else if(second<=t.second)    {        return true;    }    else    {        return false;    }}bool CTime::operator == (CTime &t){    if(hour==t.hour)    {        return true;    }    else if(minute==t.minute)    {        return true;    }    else if(second==t.second)    {        return true;    }    else    {        return false;    }}bool CTime::operator != (CTime &t){    if(hour!=t.hour)    {        return true;    }    else if(minute!=t.minute)    {        return true;    }    else if(second!=t.second)    {        return true;    }    else    {        return false;    }}CTime CTime::operator+(CTime &c){    CTime b;    b.hour=hour+c.hour;    b.minute=minute+c.minute;    b.second=second+c.second;    if(b.second>=60)    {        b.minute+=b.second/60;        b.second%=60;        if(b.minute>59)        {            b.hour+=b.minute/60;            b.minute%=60;        }        if(b.hour>23)        {            b.hour%=24;        }    }    return b;}CTime CTime::operator-(CTime &c){    CTime b;    b.hour=hour-c.hour;    b.minute=minute-c.minute;    b.second=second-c.second;     if(b.second<0)    {        b.minute+=b.second/60;        b.second%=60;        if(b.minute<0)        {            b.hour+=b.minute/60;            b.minute%=60;        }        if(b.hour<0)        {            b.hour%=24;        }    }    return b;}CTime CTime::operator+(int s)      //增加秒数{    CTime b;    b.hour=hour;    b.minute=minute;    b.second=second+s;    if(b.second>=60)    {        b.minute+=b.second/60;        b.second%=60;        if(b.minute>59)        {            b.hour+=b.minute/60;            b.minute%=60;        }        if(b.hour>23)        {            b.hour%=24;        }    }    return b;}CTime CTime::operator - (int s){    int ss=s%60;    int mm=(s/60)%60;    int hh=s/3600;    CTime t0(hh,mm,ss);    return *this-t0;}//一目运算符的重载CTime CTime::operator++(int)//后置++，下一秒{    CTime t=*this;    *this=*this+1;    return t;}CTime CTime::operator++()//前置++，下一秒{    *this=*this+1;    return *this;}CTime CTime::operator--(int)//后置--，前一秒{    CTime t=*this;    *this=*this-1;    return t;}CTime CTime::operator--()//前置--，前一秒{    *this=*this-1;    return *this;}//赋值运算符的重载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)//返回s秒后的时间{    *this=*this+s;    return *this;}CTime CTime::operator-=(int s)//返回s秒前的时间{    *this=*this-s;    return *this;}ostream& operator<<(ostream& output,CTime& t){    output<<t.hour<<":"<<t.minute<<":"<<t.second<<endl;    return output;}istream& operator>>(istream& input,CTime& t){    input>>t.hour>>t.minute>>t.second;    return input;}int main(){CTime t1(6,8,56),t2(12,56,33),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;cout<<"两个时间相加为："<<endl;t=t1+t2;t.display();    t=t1++;    cout<<"t1++=";    t.display();    t=++t1;    cout<<"++t1=";    t.display();    t1--;    cout<<"t1--=";    t1.display();    --t1;    cout<<"--t1=";    t1.display();    cout<<"t1-=t2=";    t1.display();    return 0;}