第九周-项目2-Time类中的运算符重载

/*
* 程序的版权和版本声明部分:
* Copyright (c) 2013.烟台大学计算机学院
* All rights reserved.
* 文件名称：Time 类中的运算符重载
* 作    者：冯冬影
* 完成日期：2014 年 4月 22日
* 版 本 号：v1.0
* 对任务及求解方法的描述部分:
* 输入描述：
* 问题描述：
* 程序输出:
*/
#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);
    //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: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；前置语后置返回值不一样
    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&);
};
//下面实现所有的运算符重载代码。
istream &operator>>(istream &input,CTime &t)
{
    char a,b;
    input>>t.hour>>a>>t.minute>>b>>t.second;
    return input;
}
ostream &operator<<(ostream &output,CTime &t)
{
    output<<t.hour<<":"<<t.minute<<":"<<t.second<<endl;
    return output;
}
CTime CTime::operator++(int)
{
    CTime temp(*this);
    second++;
    if(second>=60)
    {
        second-=60;
        ++minute;
        if(minute>=60)
        {

        minute-=60;
        ++hour;}
        if(hour>=24)
        hour-=24;
    }
    return temp;
}
CTime CTime::operator++()
{
    if(++second>=60)
    {
        second-=60;
        ++minute;
        if(minute>=60)
        {
          minute-=60;

        ++hour;}
        if(hour>=24)
        hour-=24;
    }
    return *this;
}
CTime CTime::operator--(int)
{
    CTime temp(*this);
    second--;
    if(second<0)
    {
        second+=60;
        --minute;
        if(minute<0)
        {minute+=60;
        --hour;

        if(hour<0)
        hour+=24;}
    }
    return temp;
}
CTime CTime::operator--()
{
    if(--second<0)
    {
        second+=60;
        --minute;
        if(minute<0)
        {
            minute+=60;
            --hour;
            if(hour<0)
            hour+=24;
        }
    }
    return *this;
}
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;
}
CTime CTime::operator+(CTime &t)
{
    CTime T;
    T.second=second+t.second;
    T.minute=minute+t.minute;
    T.hour=hour+t.hour;
    if(T.second>=60)
    {
        T.second=T.second-60;
        T.minute=T.minute+1;
    }
    if(T.minute>=60)
    {
        T.minute=T.minute-60;
        T.hour=T.hour+1;
    }
    if(T.hour>=24)
        T.hour=T.hour-24;
    return T;
}
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+=24;
    CTime t0(h,m,s);
    return t0;
}
CTime CTime::operator+(int s)//返回s秒后的时间
{
    CTime T;
    T.hour=s/3600;
    T.minute=s/60;
    T.second=s%60;
    return (*this+T);
}
CTime CTime::operator-(int s)//返回s秒前的时间
{
    CTime T;
    T.hour=s/3600;
    T.minute=s/60;
    T.second=s%60;
    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)//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;
}
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;
}
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 true;
    else
        return false;
}
//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(18,20,25),t2(12,20,50),t4(12,25,30),t3;
    cout<<"t1=";
    cout<<t1;
    cout<<"t2=";
    cout<<t2;
    cout<<"比较t1和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;
    if(t1!=t2)
        cout<<"t1!=t2"<<endl;
    cout<<"t4=";
    cout<<t4;
    t3=t1+t2;
    cout<<"t1+t2=";
    cout<<t3;
    t3=t1-t2;
    cout<<"t1-t2=";
    cout<<t3;
    int a=360;
    t3=t1+a;
    cout<<"a="<<a<<endl;
    cout<<"t1+a=";
    cout<<t3;
    t1+=a;
    cout<<"t1自加"<<a<<"之后为：";
    cout<<t1;
    t3=t4-a;
    cout<<"t4-a=";
    cout<<t3;
    t4-=a;
    cout<<"t4自减"<<a<<"之后为：";
    cout<<t4;
    CTime T1(12,23,23),T2(12,23,23),T3,T4;
    T3=++T1;
    cout<<"++T1:";
    cout<<T3;
    T3=--T1;
    cout<<"--T1:";
    cout<<T3;
    T4=T2++;
    cout<<"T2++:";
    cout<<T4;
    T4=T2--;
    cout<<"T2--:";
    cout<<T4;
    return 0;
}

运行结果