第九周项目二 Time类中的运算符重载（续）（2）定义Time类的>>和<<

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#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    //一目运算符的重载    CTime operator++(int);//后置++，下一秒    CTime operator++();//前置++，下一秒，前置与后置返回值不一样    CTime operator--( int);//后置--，前一秒    CTime operator--();//前置--，前一秒    //新增：输入输出流的重载    friend istream& operator>>(istream&,CTime &);    friend ostream& operator<<(ostream&,const CTime &);    };//istream& operator>>(istream& input,CTime &t)    {    char ch1,ch2;    while(1)        {        cout<<"请以hh:mm:ss格式输入时间："<<endl;        cin>>t.hour>>ch1>>t.minute>>ch2>>t.second;            if  (t.hour<24&&t.hour>=0&&ch1==':'&&t.minute<60&&t.minute>=0&&ch2==':'&&t.second<60&&t.second>=0)                break;            else                cout<<"时间格式输入错误，请重新输入！"<<endl;        }    return input;    }ostream& operator<<(ostream& output,const CTime &t)    {    output<<t.hour<<":"<<t.minute<<":"<<t.second;    return output;    }//CTime CTime::operator++(int)    {    CTime t=*this;    *this+=1;    return t;//!!    }CTime CTime::operator++()    {    *this+=1;    return *this;//!!    }CTime CTime::operator--(int)    {    CTime t=*this;    *this-=1;    return t;    }CTime CTime::operator--()    {    *this-=1;    return *this;    }//CTime::CTime(int h,int m,int s)    {    hour=h;    minute=m;    second=s;    return;    }void CTime::setTime(int h,int m,int s)    {    hour=h;    minute=m;    second=s;    return;    }void CTime::display()    {    cout<<hour<<": "<<minute<<": "<<second<<endl;    return;    }//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)    {    if (*this<t)return false;    else return true;    }bool CTime::operator <= (CTime &t)    {    if (*this>t)return false;    else return true;    }bool CTime::operator == (CTime &t)    {    if (*this<t||*this>t)return false;    else return true;    }bool CTime::operator != (CTime &t)    {    if (*this==t)return false;    else return true;    }//CTime CTime::operator+(CTime &t)    {    int h,m,s;    h=hour+t.hour;    m=minute+t.minute;    s=second+t.second;    if (s>59)        {        m++;        s-=60;//（莫忘了这一步）        }    if (m>59)        {        h++;        m-=60;        }    if (h>23)        {        h-=24;        }    CTime t1(h,m,s);//注意不能写成 hour=h;minute=m;second=s; 应不改变原值    return t1;    }CTime CTime::operator-(CTime &t)    {    int h,m,s;    h=hour-t.hour;    m=minute-t.minute;    s=second-t.second;    if (s<0)        {        m--;        s+=60;//莫忘了这一步        }    if (m<0)        {        h--;        m+=60;        }    if (h<0)        {        h+=24;        }    CTime t1(h,m,s);//注意不能写成 hour=h;minute=m;second=s; 应不改变原值    return t1;    }CTime CTime::operator+(int s)    {    int ss=s%60, mm=(s/60)%60, hh=s/3600;    CTime t(hh,mm,ss);    return *this+t;    /*之前用的下面这段，有点复杂了，而且减法不好处理        int ss=second+s,mm=minute,hh=hour;       if (ss>59)        {    mm+=ss/60;            ss%=60;        }        if (mm>59)        {            hh+=mm/60;            mm%=60;        }        if (hh>23)        {            hh%=24;        }        CTime t1(hh,mm,ss);        return t1;        */    }CTime CTime::operator-(int s)    {    int ss=s%60, mm=(s/60)%60, hh=s/3600;    CTime t(hh,mm,ss);    return *this-t;    }//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;    }int main()    {    CTime t1(20,30,41),t2(13,32,20),t3(20,11,36),tt1,tt2,tt3;    cout<<"t1时刻为：";    t1.display();    cout<<"t2时刻为：";    t2.display();    cout<<"t3时刻为：";    t3.display();    cout<<endl;    //    cout<<"t1与t2时刻比较大小："<<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;    if (t1<=t2)        cout<<"t1≤t2"<<endl;    cout<<endl;    //    cout<<"t2与t3时刻比较大小："<<endl;    if (t2>t3)        cout<<"t2>t3"<<endl;    if (t1<t3)        cout<<"t2<t3"<<endl;    if (t2==t3)        cout<<"t2＝t3"<<endl;    if (t2!=t3)        cout<<"t2≠t3"<<endl;    if (t2>=t3)        cout<<"t2≥t3"<<endl;    if (t2<=t3)        cout<<"t2≤t3"<<endl;    cout<<endl;    //在测试下面的代码时，请采用单步执行的方法跟踪    cout<<"下面执行时间计算更改调试："<<endl;    cout<<"t1+t2=";    tt1=t1+t2;    tt1.display();    cout<<"t2-t3=";    tt2=t2-t3;    tt2.display();    cout<<"t1+2000s=";    tt3=t1+2000;    tt3.display();    cout<<"t1+2000s-5000s=";    tt3=tt3-5000;    tt3.display();    cout<<"t1+=t2: ";    t1+=t2;    t1.display();    cout<<"t2-=t3: ";    t2-=t3;    t2.display();    cout<<"t3+=100: ";    t3+=100;    t3.display();    cout<<"t3'-=600: ";    t3-=600;    t3.display();    cout<<"t1++ :";    tt1=t1++;    tt1.display();    cout<<"++t1 :";    tt1=++t1;    tt1.display();    cout<<"t1-- :";    tt1=t1--;    tt1.display();    cout<<"--t1 :";    tt1=--t1;    tt1.display();    cout<<endl;    cin>>tt2;    cout<<"输入的时刻显示："<<tt2;    return 0;    }

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