Time类中的运算符重载

/*
*Copyright (c) 2016,烟台大学计算机学院
*All rights reserved.
*文件名称：main.cpp
*作    者：郭辉
*完成时间：2016年5月25日
*版 本 号：v1.0
*
*问题描述：项目-Time类中的运算符重载
*输入描述：无。
*程序输出：两个数的算法公式及结果。
*/
#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
//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;
}
void CTime::display()
{

cout<<hour<<":"<<minute<<":"<<second<<endl;
}
bool CTime::operator > (CTime &t)
{
if(hour>t.hour)
return true;
else if(hour<t.hour)
return false;
if(hour==t.hour&&minute>t.minute)
return true;
else if(minute<t.minute)
return false;
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)
return false;
if(hour==t.hour&&minute<t.minute)
return true;
else if(minute<t.minute)
return false;
if(hour==t.hour&&minute==t.minute&&second<t.second)
return true;
else
return false;
}
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(hour==t.hour&&minute==t.minute&&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;
}
CTime CTime::operator+(CTime &t)
{
CTime c;
c.hour=hour+t.hour;
c.minute=minute+t.minute;
c.second=second+t.second;
if(c.second>59)
{
c.second-=60;
c.minute++;
if(c.minute>59)
{
c.minute-=60;
c.hour++;
}
}
return c;
}
CTime CTime::operator-(CTime &t)
{
/*CTime c1;
c1.hour=hour-t.hour;
c1.minute=minute-t.minute;
c1.second=second-t.second;
if(c1.second<0)
{
c1.second+=60;
c1.minute--;
if(c1.minute<0)
{
c1.minute+=60;
c1.hour--;
}
}
return c1;*/
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--;
}
while (h<0) h+=24;
CTime t0(h,m,s);
return t0;
}
CTime CTime::operator+(int s)
{
CTime c;
c.second=second+s%60;
c.minute=minute+(s/60)%60;
c.hour=hour+s/3600;
return c;
}
CTime CTime::operator-(int s)
{
/*CTime c;
c.second=second-s%60;
c.minute=minute-(s/60)%60;
c.hour=hour-s/3600;
return c;*/
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)
{
*this=*this+s;
return *this;
}
CTime &CTime::operator-=(int s)
{
*this=*this-s;
return *this;
}
CTime CTime::operator++(int n)//后置++，下一秒
{
CTime c=*this;
*this=*this+n;
return c;
}
CTime &CTime::operator++()//前置++，下一秒
{
*this=*this+1;
return *this;
}
CTime CTime::operator--( int n)//后置--，前一秒
{
CTime c=*this;
*this=*this-n;
return c;
}
CTime &CTime::operator--()//前置--，前一秒
{
*this=*this-1;
return *this;
}
int main()
{
CTime t1(8,20,25),t2(11,20,50),t,t3;

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= ";
t1.display();
cout<<endl;
cout<<"t2= ";
t2.display();
cout<<endl;
cout<<"t=t1++"<<endl;
t=t1++;
cout<<"t= ";
t.display();
cout<<"    t1= ";
t1.display();
cout<<endl;

cout<<"t=++t1"<<endl;
t=++t1;
cout<<"t= ";
t.display();
cout<<"    t1= ";
t1.display();
cout<<endl;
t3=t1+t2;
cout<<"t1+t2= ";t3.display();cout<<endl;
t3=t1-t2;
cout<<"t1-t2= ";t3.display();cout<<endl;
t3=t1+2000;
cout<<"t1+2000= ";t3.display();cout<<endl;
t3=t1-5000;
cout<<"t1-5000= ";t3.display();cout<<endl;
return 0;
}

运行结果：<img src="http://img.blog.csdn.net/20160525153855800" alt="" />