第十二周项目二 时间类的运算符重载

/*           
 *Copyright(c) 2016,烟台大学计算机学院           
 *作    者：刘金石           
 *完成日期：2016年5月12日           
 *问题描述：运算符重载练习 
 */  
#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();
    //输入输出运算的重载
    friend istream &operator>>(istream &in,CTime &t);
    friend ostream &operator<<(ostream &out,CTime t);
    //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
    CTime operator--( int);//后置--，前一秒
    CTime &operator--();//前置--，前一秒
};
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;
}
//输入输出运算符的重载
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;
    if(second<t.second)return false;
}
bool CTime::operator < (CTime &t)
{
    if(hour>t.hour)return false;
    if(hour<t.hour)return true;
    if(minute>t.minute)return false;
    if(minute<t.minute)return true;
    if(second>t.second)return false;
    if(second<t.second)return true;
}
bool CTime::operator >= (CTime &t)
{
    if((*this<t)==true)
        return false;
    else return true;
}
bool CTime::operator <= (CTime &t)
{
    if((*this>t)==true)
        return false;
    else return true;
}
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((*this==t)==true)
        return false;
    else return true;
}
//二目的加减运算符的重载
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-(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=h+24;
    CTime t0(h,m,s);
    return t0;
}
CTime CTime::operator+(int s)
{
    int se,mi,ho;
    se=s%60;
    mi=(s/60)%60;
    ho=s/3600;
    CTime t1(se,mi,ho);
    return *this+t1;
}
CTime CTime::operator-(int s)
{
    int se,mi,ho;
    se=s%60;
    mi=(s/60)%60;
    ho=s/3600;
    CTime t1(se,mi,ho);
    return *this-t1;
}
 //二目赋值运算符的重载
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;
}
//一目运算符的重载
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;
}
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：