第十二周上机实践——项目2-Time类中的运算符重载

/* *Copyright (c)2016,烟台大学计算机与控制工程学院 *All rights reserved. *文件名称：main.cpp *作    者：郭永恒 *完成日期：2016年5月18日 *版 本 号：v1.0 * *问题描述：实现Time类中的运算符重载 */#include <iostream>using namespace std;class CTime{public:    CTime(int h=0,int m=0,int s=0);    void setTime(int h,int m,int s);    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);    CTime operator+(CTime &c);    CTime operator-(CTime &c);    CTime operator+(int s);    CTime operator-(int s);    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 &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private:    unsigned short int hour;    unsigned short int minute;    unsigned short int second;};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;}istream &operator>>(istream &is,CTime &t){    char ch1,ch2;    while(1)    {        cout << " 请输入时间(hh:mm:ss) ";        is >> t.hour >> ch1 >> t.minute >> ch2 >> t.second;/**这里些is，老贺写成了cin**/        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";        is.clear();        is.sync();    }    return is;}ostream &operator<<(ostream &os,CTime t){    os << t.hour << ':' << t.minute << ':' << t.second;    return os;}bool CTime::operator<(CTime &t){    return ((hour<t.hour)||(hour==t.hour && minute<t.minute)||(hour==t.hour && minute==t.minute && second<t.second));}bool CTime::operator>(CTime &t){    return ((hour>t.hour)||(hour==t.hour && minute>t.minute)||(hour==t.hour && minute==t.minute && second>t.second));}bool CTime::operator == (CTime &t){    return ((hour==t.hour)&&(minute==t.minute)&&(second==t.second));}bool CTime::operator != (CTime &t){    return !(*this == t);}bool CTime::operator >= (CTime &t){    return !(*this<t);}bool CTime::operator <= (CTime &t){    return !(*this>t);}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-=60;        m++;    }    if (m>59)    {        m-=60;        h++;    }    while (h>23) h-=24;    CTime t0(h,m,s);    return t0;}//返回s秒后的时间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;}// 计算时间之差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+=60;        m--;    }    if (m<0)    {        m+=60;        h--;    }    while (h<0) h+=24;    CTime t0(h,m,s);    return t0;}//返回s秒前的时间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;}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：