15第八周项目二——Time类中的运算符重载

/*

* Copyright (c) 2014, 烟台大学计算机学院

* All rights reserved.

* 文件名称：test.cpp

* 作 者：李晓凯

* 完成日期：2015年 4 月 29 日

* 版 本 号：v1.0

*

* 问题描述：实现Time类的运算符重载

* 输入描述：

* 程序输出：运算结果

*/

#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)
{
hour=h;
minute=m;
second=s;
}
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
};
bool CTime::operator>(CTime &t)
{
if(hour>t.hour)
return true;
if(minute>t.minute)
return true;
if(second>t.second)
return true;
return false;
}
bool CTime::operator<(CTime &t)
{
if(hour<t.hour)
return true;
if(minute<t.minute)
return true;
if(second>t.second)
return true;
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(*this>t||*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;
h=hour+t.hour;
m=minute+t.minute;
s=second+t.second;
if(s>59)
{
s-=60;
m++;
}
if(m>59)
{
m-=60;
h++;
}
if(h>23)
{
h-=23;
}
return CTime (h,m,s);
}
CTime CTime::operator-(CTime &t)
{
int h,m,s;
s=second-t.second;
m=minute-t.minute;
h=hour-t.hour;
if(s<0)
{
m--;
s+=60;
}
if(m<0)
{
m+=60;
h--;
}
if(h<0)
{
h+=24;
}
return CTime (h,m,s);
}
CTime CTime::operator+(int s)
{
int s0=s%60;
int m0=s%360;
int h0=s/3600;
CTime d(h0,m0,s0);
return *this+d;
}
CTime CTime::operator-(int s)
{
int s1=s%60;
int m1=s%360;
int h1=s/3600;
CTime d(h1,m1,s1);
return *this-d;
}

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;
}
void CTime::display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
int main()
{
CTime t1(8,20,25),t2(11,20,50),t3;
int s=3600;
cout<<"t1=";
t1.display();
cout<<"t2=";
t2.display();
cout<<"s="<<s<<endl<<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;
cout<<"t1+t2=";
t3=t1+t2;
t3.display();
cout<<"t1-t2=";
t3=t1-t2;
t3.display();
cout<<s<<"秒后:t1=";
t3=t1+s;
t3.display();
cout<<s<<"秒前:t1=";
t3=t1-s;
t3.display();
t1+=t2;
t1.display();
t1-=t2;
t1.display();
t1+=s;
t1.display();
t1-=s;
t1.display();
return 0;
}