第九周——项目二

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/**Copyright (c) 2013, 烟台大学计算机学院* All rights reserved.* 作    者：申玉迪* 完成日期：2014 年 4 月 27 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{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)    {        hour=h;        minute=m;        second=s;    }    void setTime(int h,int m,int s)    {        hour=h;        minute=m;        second=s;    }    void display();    //二目的比较运算符重载    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: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    CTime operator++(int);    CTime operator++();    CTime operator--(int);    CTime operator--();    friend istream&operator>>(istream&,CTime&);    friend ostream&operator<<(ostream&,CTime&);};CTime CTime::operator+(CTime &t){    CTime p;    p.hour=hour+t.hour;    p.minute=minute+t.minute;    p.second=second+t.second;    if(p.second>=60)    {        p.minute++;        p.second-=60;    }    if(p.minute>=60)    {        p.hour++;        p.minute-=60;    }    if(p.hour>=24)    {        p.hour-=24;    }    return p;}CTime CTime::operator-(CTime &t){    CTime p;    int s,m,h;     s=second-t.second;     m=minute-t.minute;    h=hour-t.hour;    if(s<0)    {        s+=60;        m--;    }    if(m<0)    {        m+=60;        h--;    }    if(h<0)    {        h+=24;    }    p.hour=h;    p.minute=m;    p.second=s;    return p;}CTime CTime::operator+(int s){    second=second+s;    while(second>=60)    {        second=second-60;        minute++;        if(minute>=60)        {            hour++;            minute=minute-60;        }        if(hour>=24)        {            hour=hour-24;        }    }    return CTime(hour,minute,second);}CTime CTime::operator-(int s){    /*second=second-s;//因为前面定义的是unsigned short int，所以second就不会出现负数，即此方法不可用    while(second<0)    {        second+=60;        minute--;        if(minute<0)        {            hour--;            minute+=60;        }        if(hour<0)        {            hour+=24;        }    }    return CTime(hour,minute,second);*/    int  s1,m1,h1;    s1=s%60;    m1=(s/60)%60;    h1=s/3600;    CTime t3(h1,m1,s1);    return *this-t3;}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;}bool CTime::operator>(CTime &t){    if(hour>t.hour)return true;    if(hour<t.hour)return false;    if(minute>t.minute)return true;    if(minute<t.minute)return false;    if(second>t.second)return true;    return false;}bool CTime::operator<(CTime &t){    if(hour<t.hour)return true;    if(hour>t.hour)return false;    if(minute<t.minute)return true;    if(minute>t.minute)return false;    if(second<t.second)return true;    return false;}bool CTime::operator <= (CTime &t) // 判断时间t1<=t2{    if (*this > t) return false;    return true;}bool CTime::operator >= (CTime &t){    if (*this < t) return false;    return true;}bool CTime::operator==(CTime &t){    if(hour==t.hour&&minute==t.minute&&second==t.second)        return true;    return false;}bool CTime::operator!=(CTime &t){    if(*this==t)return false;    return true;}CTime CTime::operator++(int s){    second+=s;    if(second>=60)    {        minute++;        second-=60;    }    if(minute>=60)    {        hour++;        minute-=60;    }    if(hour>=24)    {        hour-=24;    }    return CTime(hour,minute,second);}CTime CTime::operator++(){    ++second;   if(second>=60)    {        minute++;        second-=60;    }    if(minute>=60)    {        hour++;        minute-=60;    }    if(hour>=24)    {        hour-=24;    }    return CTime(hour,minute,second);}CTime CTime::operator--(int s){    int  s1,m1,h1;    s1=s%60;    m1=(s/60)%60;    h1=s/3600;    CTime t3(h1,m1,s1);    return *this-t3;}CTime CTime::operator--(){    int s1,m1,h1;    s1=second;    m1=minute;    h1=hour;    --s1;    if(s1<0)    {        s1+=60;        m1--;    }    if(m1<0)    {        m1+=60;        h1--;    }    if(h1<0)    {        h1+=24;    }    return CTime(s1,m1,h1);}istream& operator>>(istream&input,CTime& t){    char a;    input>>t.hour>>a>>t.minute>>a>>t.second;    while(1)    {        if(a!=':'||(t.hour>=24||t.hour<0)||(t.minute>=60||t.minute<0)||(t.second>=60||t.second<0))        {            cout<<"格式有误，请重新输入。";            input>>t.hour>>a>>t.minute>>a>>t.second;        }        else        break;    }    return input;}ostream&operator<<(ostream&output,CTime&t){    output<<t.hour<<':'<<t.minute<<':'<<t.second<<endl;    return output;}int main(){    CTime t1,t2,t;    cout<<"请输入t1和t2：";    cin>>t1>>t2;    cout<<"t1为："<<t1;    cout<<"t2为："<<t2;    if(t1>t2)        cout<<"t1>t2"<<endl;    if(t1<t2)        cout<<"t1<t2"<<endl;    if(t1==t2)        cout<<"t1=t2"<<endl;    cout<<"t1+t2=";    t=t1+t2;    cout<<t;    cout<<"t2-t1=";    t=t2-t1;    cout<<t;    t=t1+300;    cout<<"t1+300s=";    cout<<t;    t=t2-600;    cout<<"t2-600s=";    cout<<t;    cout<<"t1自加500s后：";    t1+=500;    cout<<t1;    cout<<"t2自减900s后：";    t2-=900;    cout<<t2;    return 0;}
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