第九周项目二-Time类中的运算符重载（续）

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<span style="color: rgb(85, 85, 85); font-family: 'microsoft yahei'; font-size: 15px; line-height: 35px;">在Time类中的运算符重载基础上</span><br style="color: rgb(85, 85, 85); font-family: 'microsoft yahei'; font-size: 15px; line-height: 35px;" /><p style="margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: rgb(85, 85, 85); font-family: 'microsoft yahei'; font-size: 15px; line-height: 35px;">（1）定义对时间对象的自增和自减一目运算符</p><p style="margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: rgb(85, 85, 85); font-family: 'microsoft yahei'; font-size: 15px; line-height: 35px;">（2）定义Time类中的<<和>>运算符重载，实现时间的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。</p>

/** Copyright (c) 2015,烟台大学计算机学院* All right reserved.* 作者：赵嵩* 文件：Demo.cpp* 完成时间：2015年05月17日* 版本号：v1.0*/#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    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    friend istream &operator>>(istream &in,CTime &t);    friend ostream &operator<<(ostream &out,CTime t);    //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;}void CTime::display(){    cout<<hour<<":"<<minute<<":"<<second<<endl;}// 重载输入运算符>>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";    }    return cin;}// 重载输出运算符<<ostream &operator<<(ostream &out,CTime t){    out<<t.hour<<':'<<t.minute<<':'<<t.second;    return out;}bool CTime::operator > (CTime &t){    int s1,s2;    s1=hour*3600+minute*60+second;    s2=t.hour*3600+t.minute*60+t.second;    if (s1>s2) return true;    else        return false;}bool CTime::operator < (CTime &t){    int s1,s2;    s1=hour*3600+minute*60+second;    s2=t.hour*3600+t.minute*60+t.second;    if (s1<s2) return true;    else        return false;}bool CTime::operator >= (CTime &t){    if (*this > t) return true;    return false;}bool CTime::operator <= (CTime &t){    if (*this > t) return false;    return true;}bool CTime::operator == (CTime &t){    int s1,s2;    s1=hour*3600+minute*60+second;    s2=t.hour*3600+t.minute*60+t.second;    if (s1==s2) return true;    else        return false;}bool CTime::operator != (CTime &t){    int s1,s2;    s1=hour*3600+minute*60+second;    s2=t.hour*3600+t.minute*60+t.second;    if (s1!=s2) return true;    else        return false;}CTime CTime::operator+(CTime &t){    int s;    s=t.hour*3600+t.minute*60+t.second;    while (s--)    {        second++;        if (second>60)        {            minute++;            second=1;        }        if (minute>60)        {            hour++;            minute=1;        }    }    CTime a(hour,minute,second);    return a;}CTime CTime::operator-(CTime &t){    int s;    s=t.hour*3600+t.minute*60+t.second;    while (s--)    {        second--;        if (second<0)        {            minute--;            second=60;        }        if (minute<0)        {            hour--;            minute=60;        }    }    CTime a(hour,minute,second);    return a;}CTime CTime::operator+(int s){    while (s--)    {        second++;        if (second>60)        {            minute++;            second=1;        }        if (minute>60)        {            hour++;            minute=1;        }    }    CTime a(hour,minute,second);    return a;}CTime CTime::operator-(int s){    while (s--)    {        second--;        if (second<0)        {            minute--;            second=60;        }        if (minute<0)        {            hour--;            minute=60;        }    }    CTime a(hour,minute,second);    return a;}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;}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;}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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