Time类中的运算符重载

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问题及描述；
/* *Copyright (c) 2016,烟台大学计算机学院 *All rights reserved. *文件名称；test.cpp *作者；邱凯 *完成日期；2016年5月14号 *版本号；v6.0 *问题描述;   Time类中的运算符重载 *输入描述；  输入数据 *输出描述； 输出答案*/#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();    //二目的比较运算符重载     friend istream &operator>>(istream &in,CTime &t);    friend ostream &operator<<(ostream &out,CTime t);    bool operator > (CTime &t);    bool operator < (CTime &t);    bool operator >= (CTime &t);    bool operator <= (CTime &t);    bool operator == (CTime &t);    bool operator != (CTime &t);    //二目的加减运算符的重载    //返回t规定的时、分、秒后的时间    //例t1(8,20,25),t2(11,20,50)，t1+t2为19:41:15    CTime operator+(CTime &t);    CTime operator-(CTime &t);//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    //二目赋值运算符的重载    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    //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};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;                else                    return false;        }        else            return false;    }      else        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;                else                    return false;        }        else            return false;    }      else        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;                else                    return false;        }        else            return false;    }      else        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;                else                    return false;        }        else            return false;    }      else        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;                else                    return false;        }        else            return false;    }      else        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;                else                    return false;        }        else            return false;    }      else        return false;}CTime CTime ::operator+(CTime &t){    int h,m,s;    s=second+t.second;    m=minute+t.minute;    h=hour+t.hour;    if(s>59)    {        s=s-60;        m=m+1;    }    if (m>59)    {        m-=60;        h++;    }  while(h>23)    h-=24;       CTime t0(h,m,s);    return t0;}CTime CTime ::operator+(int s){    int h1,m1,s1;    s1=s%60;    m1=(s/60)%60;    h1=s/3600;    CTime t0(h1,m1,s1);    return *this+t0;}CTime CTime ::operator-(CTime &t){    int h,m,s;    s=second-t.second;    m=minute-t.minute;    h=hour-t.hour;    if(s<0)    {        s=s+60;        m=m-1;    }    if (m<0)    {        m+=60;        h--;    }  while(h<0)    h+=24;       CTime t0(h,m,s);    return t0;}CTime CTime ::operator-(int s){    int h1,m1,s1;    s1=s%60;    m1=(s/60)%60;    h1=s/3600;    CTime t0(h1,m1,s1);    return *this-t0;}CTime CTime ::operator++(int){     CTime t=*this;    *this=*this+1;    return t;}CTime &CTime::operator++(){    *this=*this+1;    return *this;}CTime CTime::operator--(int){    *this=*this-1;    return  *this;}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){    *this=*this+s;    return *this;}CTime &CTime::operator-=(int s){    *this=*this-s;    return *this;}istream &operator>>(istream &in,CTime &t){    char ch1,ch2;    while(1)    {        cout<<"请输入时间(hh:mm:ss) ";        cin>>t.hour>>ch1>>t.minute>>ch2>>t.second;        if (ch1==':' && ch2==':')            if (t.hour>-1 && t.hour<24 && t.minute>-1 && t.minute<60 && t.second>-1 && t.second<60) break;        cerr<<"时间格式不正确! 请重新输入\n";//产生错误输出此结果.    }    return cin;}// 重载输出运算符<<ostream &operator<<(ostream &out,CTime t){    out<<t.hour<<':'<<t.minute<<':'<<t.second;    return out;}int main(){   CTime t1,t2,t;    cout<<"t1为：";    cin>>t1;    cout<<"t2为：";    cin>>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;    cout<<"t1= "<<t1<<endl;    cout<<"t2= "<<t2<<endl;    cout<<"t=t1++"<<endl;    t=t1++;    cout<<"t= "<<t<<"    t1= "<<t1<<endl;    cout<<"t=++t1"<<endl;    t=++t1;    cout<<"t= "<<t<<"    t1= "<<t1<<endl;    cout<<"t1+t2= "<<t1+t2<<endl;    cout<<"t1-t2= "<<t1-t2<<endl;    cout<<"t1+2000= "<<t1+2000<<endl;    cout<<"t1-5000= "<<t1-5000<<endl;    return 0;}
运行结果；
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