第九周项目2

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/* 程序的版权和版本声明部分* Copyright (c)2013, 烟台大学计算机学院学生* All rightsreserved.* 文件名称： object.cpp* 作者：王英华* 完成日期： 2013年04月22日* 版本号： v1.0* 输入描述：无* 问题描述：无* 程序输出：无*/#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 display()    {        cout<<hour<<":"<<minute<<":"<<second<<endl;    }    //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    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    friend ostream&operator<<(ostream&,CTime&);    friend istream&operator>>(istream&,CTime&);};CTime::CTime(int h,int m,int s){    hour=h;    minute=m;    second=s;}bool CTime::operator > (CTime &t){    if(hour>t.hour)        return true;    else if(hour==t.hour&&minute>t.minute)        return true;    else if(minute==t.minute&&second>t.second)        return true;    else        return false;}bool CTime::operator < (CTime &t){    if(hour<t.hour)        return true;    else if(hour==t.hour&&minute<t.minute)        return true;    else if(minute==t.minute&&second<t.second)        return true;    else        return false;}bool CTime::operator >= (CTime &t){    if(hour>t.hour)        return true;    else if(hour==t.hour && minute>t.minute)        return true;    else if(hour==t.hour && minute==t.minute && second>t.second)        return true;    else if(hour==t.hour && minute==t.minute && second==t.second)        return true;    else        return false;}bool CTime::operator <= (CTime &t){    if(hour<t.hour)        return true;    else if(hour==t.hour && minute<t.minute)        return true;    else if(hour==t.hour && minute==t.minute && second<t.second)        return true;    else if(hour==t.hour && minute==t.minute && second==t.second)        return true;    else        return false;}bool CTime::operator == (CTime &t){    if(hour==t.hour&&minute==t.minute&&second==t.second)        return true;    else        return false;}bool CTime::operator!=(CTime &t){    if(hour==t.hour&&minute==t.minute&&second==t.second)        return false;    else        return true;}CTime CTime::operator+(CTime &t){    CTime a;    a.hour=hour+t.hour;    a.minute=minute+t.minute;    a.second=second+t.second;    if(a.second>=60)    {        a.second=a.second-60;        a.minute+=1;    }    if(a.minute>=60)    {        a.minute=a.minute-60;        a.hour+=1;    }    if(a.hour>=24)    {        a.hour=a.hour-24;    }    return a;}CTime CTime::operator-(CTime &t){   CTime a;   a=*this;   if(a.second<t.second)    {        a.second=a.second+60-t.second;        a.minute-=1;    }    else    {        a.second-=t.second;    }    if(a.minute<t.minute)    {        a.minute=a.minute+60-t.minute;        a.hour-=1;    }    else    {        a.minute-=t.minute;    }    if(a.hour<t.hour)    {        a.hour=a.hour+12-t.hour;    }    else    {        a.hour-=t.hour;    }    return a;}CTime CTime::operator+(int s){    CTime c;    c=*this;    c.second+=s;    while(c.second>=60)    {        c.second-=60;        c.minute+=1;    }    while(c.minute>=60)    {        c.hour+=1;        c.minute-=60;    }    return c;}CTime CTime::operator-(int s){    CTime c;    c=*this;    while(c.second<s)    {        c.second+=60;        c.minute-=1;        if(c.minute<0)        {            c.hour-=1;            c.minute=59;            if(c.hour<0)            {                c.hour=11;            }        }    }    c.second-=s;    return c;}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=*this;    *this=*this-1;    return t;}CTime CTime::operator--(){    *this=*this-1;    return *this;}ostream & operator<<(ostream &output,CTime &c){    output<<c.hour<<":"<<c.minute<<":"<<c.second;    return output;}istream & operator>>(istream &input,CTime &c){    cout<<" 输入时，分，秒:";    input>>c.hour>>c.minute>>c.second;  return input;}//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(8,20,25),t2(11,20,50),t3,t;    cout<<"t1为：";    t1.display();    cout<<"t2为：";    t2.display();    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+t2="<<endl;    t3=t1+t2;    t3.display();    cout<<"t1-t2="<<endl;    t3=t1-t2;    t3.display();    t=t1+100; //秒    cout<<"t1+100s=";    t.display();    t=t1-100;  //秒    cout<<"t1-100s=";    t.display();    cout<<"t1+=t2:";    t1+=t2;    t1.display();    cout<<"t1-=t2:";    t1-=t2;    t1.display();    cout<<"t1+=100s:";    t1+=100;    t1.display();    cout<<"t2+=100:";    t2+=100;    t2.display();    cout<<"t1-=100:";    t1-=100;    t1.display();    cout<<"t2-=100:";    t2-=100;    t2.display();    return 0;}
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