9.2

来源：互联网发布：ubuntu使用搜狗输入法编辑：程序博客网时间：2024/04/30 13:38
#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);    //输入输出运算的重载    friend istream &operator>>(istream &in,CTime &t);    friend ostream &operator<<(ostream &out,CTime t);    //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    //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     //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};//下面实现所有的运算符重载代码。      //构造函数      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 &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;}     //二目的比较运算符重载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;}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 || *this>t) return false;    return true;}bool CTime::operator != (CTime &t){    if (*this==t) return false;    return true;} //返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15 CTime 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 t1(h,m,s);    return t1; } 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-(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++(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;}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;}//自行编制用于测试的main()函数，有些结果不必依赖display()函数，提倡用单步执行查看结果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;}
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