第十二周上机时间项目——项目2-Time类中的运算符重载

/

 *Copyright (c) 2016,烟台大学计算机与控制工程学院 

 *All rights reserved. 
 *文件名称：TIME.cpp 
 *作    者：郑志金
 *完成日期：2016年6月9日 
 *版 本 号：v1.0 
 * 
 *问题描述：实现TIME类中的运算符重载
 *输入描述：无
 *输出描述：两个TIME比较的结果
#include <iostream>

using namespace std;

class CTime

{

private:

    unsigned short int hour;

    unsigned short int minute;

    unsigned short int second;

public:

    CTime(int h=0,int m=0,int s=0);

    void setTime(int h,int m,int s);

    friend istream &operator>>(istream &in,CTime &t);

    friend ostream &operator<<(ostream &out,CTime t);

    bool operator > (CTime &t);

    bool operator < (CTime &t);

    bool operator >= (CTime &t);

    bool operator <= (CTime &t);

    bool operator == (CTime &t);

    bool operator != (CTime &t);

    CTime operator+(CTime &c);

    CTime operator-(CTime &c);

    CTime operator+(int s);

    CTime operator-(int s);

    //一目运算符的重载

    CTime operator++(int);

    CTime &operator++();

    CTime operator--(int);

    CTime &operator--();

    CTime &operator+=(CTime &c);

    CTime &operator-=(CTime &c);

    CTime &operator+=(int s);

    CTime &operator-=(int s);

};

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;

}

ostream &operator<<(ostream &out,CTime t)

{

    out<<t.hour<<':'<<t.minute<<':'<<t.second;

    return out;

}

 

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 (hour==t.hour&&minute==t.minute&&second==t.second)

        return false;

        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) return false;

    return true;

}

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++;

    }

    while (h>23) 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 - (CTime &t)

{

    int h,m,s;

    s=second-t.second;

    m=minute-t.minute;

    h=hour-t.hour;

    if (s<0)

    {<
4000
br />
        s+=60;

        m--;

    }

    if (m<0)

    {

        m+=60;

        h--;

    }

    while (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)

{

    CTime t=*this;

    *this=*this+1;

    return t;

}

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;

}

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,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：