Time类中的运算符重载（续）

代码：

#include <iostream>using namespace std;class CTime{private:    short int hour;    short int minute;    short int second;public:    CTime(int h=0,int m=0,int s=0);    void setTime(int h,int m,int s);    void display();    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 &t);    CTime operator-(CTime &t);    CTime operator+(int s);    CTime operator-(int s);    CTime operator+=(CTime &c);    CTime operator-=(CTime &c);    CTime operator+=(int s);    CTime operator-=(int s);    CTime operator++(int);    CTime operator++();    CTime operator--(int);    CTime operator--();    friend istream &operator>>(istream &in,CTime &t);    friend ostream &operator<<(ostream &out,CTime t);};istream& operator>>(istream& in,CTime&c){    char m1,m2;    while(1)    {        in>>c.hour>>m1>>c.minute>>m2>>c.second;        if (m1==':' && m2==':')            if (c.hour>-1 && c.hour<24 && c.minute>-1 && c.minute<60 && c.second>-1 && c.second<60) break;        cerr<<"时间格式不正确! 请重新输入\n";    }    return in;}ostream &operator<<(ostream&output,CTime c){    output<<c.hour<<':'<<c.minute<<':'<<c.second;    return output;}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;    if (hour<t.hour) return false;    if (minute>t.minute) return true;    if (minute<t.minute) return false;    if (second>t.second) return true;}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;}bool CTime::operator == (CTime &t){    if (*this < t || *this > t) return false;    return true;}bool CTime::operator != (CTime &t){    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 (*this > t) return false;    return true;}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++;    }    if (h>23) h-=24;    CTime t0(h,m,s);    return t0;}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;}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--;    }    if (h<0) h+=24;    CTime t0(h,m,s);    return t0;}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;}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++(){    *this=*this+1;    return *this;}CTime CTime::operator++(int){    CTime t;    t=*this;    *this=*this+1;    return t;}CTime CTime::operator--(){    *this=*this-1;    return *this;}CTime CTime::operator--(int){    CTime t;    t=*this;    *this=*this-1;    return t;}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：