第八周项目2 Time类中的运算符重载

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</pre><pre class="cpp" name="code">/* *Copyright(c)2014,烟台大学计算机学院 *All rights reserved. *文件名称：test.cpp *作者：曾晓 *完成日期：2015年 4月 29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};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;    else        return false;    if(minute>t.minute)        return true;    else        return false;    if(second>t.second)        return true;    else        return false;}bool CTime::operator < (CTime &t){    if(hour<t.hour)        return true;    else        return false;    if(minute<t.minute)        return true;    else        return false;    if(second<t.minute)        return true;    else        return false;}bool CTime::operator >= (CTime &t){    if(hour>=t.hour)        return true;    else        return false;    if(minute>=t.minute)        return true;    else        return false;    if(second>=t.second)        return true;    else        return false;}bool CTime::operator <= (CTime &t){    if(hour<=t.hour)        return true;    else        return false;    if(minute<=t.minute)        return true;    else        return false;    if(second<=t.second)        return true;    else        return false;}bool CTime:: operator == (CTime &t){    if(hour==t.hour)        return true;    else        return false;    if(minute==t.minute)        return true;    else        return false;    if(second==t.second)        return true;    else        return false;}bool CTime::operator != (CTime &t){    if(hour!=t.hour)        return true;    else        return false;    if(minute!=t.minute)        return true;    else        return false;    if(second!=t.second)        return true;    else        return false;}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;    }    if(m>59)    {        h++;        m-=60;    }    if(h>23)    {        h-=24;    }    CTime t0(h,m,s);    return t0;}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;    }    if(m<0)    {        h--;        m+=60;    }    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+=(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;}int main(){    CTime t1(8,20,25),t2(11,20,50),t;    cout<<"t1=";    t1.display();    cout<<"t2=";    t2.display();    cout<<"比较两个时间的大小："<<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;    t=t1+t2;    t.display();    t=t1-t2;    t.display();    t=t1+2000;    t.display();    t=t1-5000;    t.display();    t1+=t2;    t1.display();    t1-=t2;    t1.display();    t1+=2000;    t1.display();    t1-=5000;    t1.display();    return 0;}
运行结果：
忽略了*this，真是尝到苦头了><
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