8-2-Time类中的运算符重载

01./*
02.* 程序的版权和版本声明部分:
03.* Copyright (c) 2011, 烟台大学计算机学院
04.* All rights reserved.
05.* 文件名称：test.cpp
06.* 作    者：刘芳
07.* 完成日期：2014 年04 月22  日
08.* 版 本 号：v1.0
09.* 对任务及求解方法的描述部分:
10.* 输入描述：无
11.* 问题描述：
12.* 程序输出：
13.* 问题分析：略
14.* 算法设计：略
15.*/

#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: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
};
//下面实现所有的运算符重载代码。

//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

void CTime::setTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
}
bool CTime::operator>(CTime &t)
{
if(hour>t.hour||(hour==t.hour&&minute>t.minute)||
(hour==t.hour&&minute==t.minute&&second>t.second))
return true;
else
return false;
}
bool CTime::operator < (CTime &t)
{
if(hour<t.hour||(hour==t.hour&&minute<t.minute)||
(hour==t.hour&&minute==t.minute&&second<t.second))
return true;
else
return false;
}
bool CTime::operator >= (CTime &t)
{
if(!operator<(t))
return true;
else
return false;
}
bool CTime::operator <=(CTime &t)
{
if(!operator>(t))
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(!operator == (t))
return true;
else
return false;
}
CTime::CTime(int h,int m,int s )
{
hour=h;
minute=m;
second=s;
}
CTime CTime::operator+(CTime &t)
{
CTime b;
int q,w,e;

q=second+t.second;
w=minute+t.minute;
e=hour+t.hour;
if(q<=59)
b.second=q;
if(q>59)
{
b.second=q%60;
w=(q/60)+w;
}
if(w<=59)
b.minute=w;
if(w>59)
{
b.minute=w%60;
e=(w/60)+e;

}if(e<=23)
b.hour=e;
if(e>23)
b.hour=e%24;
return b;
//if(b.second>=60&&b.minute<59
}
CTime CTime::operator-(CTime &t)
{
CTime t4;
int s=0,m=0,h=0;
s=second-t.second;

{
if(s>=0)
t4.second=s;
else
{
s=(s+60);
t4.second=s;
m--;
}
}
m=(minute-t.minute+m);
{
if(m>=0)

t4.minute=m;

else
{
m=(m+60);
h--;
t4.minute=m;
}
}
h=hour-t.hour+h;
{
if(h>=0)
t4.hour=h;
else
{
h=h+24;
t4.hour=h;
}

}
return t4;
}
void CTime::display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
CTime CTime::operator+(int s)
{
CTime b;
int q,w,e;
q=second+s;
w=minute;
e=hour;
if(q<60)
b.second=q;
if(q>59)
{
b.second=(q%60);
w=(q/60)+minute;
}
if(w<60)
{
b.minute=w;
}
if(w>59)
{
b.minute=(w%60);
e=(w/60)+hour;
}
if(e<=23)
b.hour=e;
if(e>23)
{
b.hour=e%24;
}

return b;
}
CTime CTime::operator-(int s)

{
CTime b;
int q,w,e;
q=second-s;
w=minute;
e=hour;
if(q>=0&&q<60)
b.second=q;
while(q<0)
{
q=q+60;
w--;
b.second=q;
}
if(w>=0&&w<60)
{
b.minute=w;
}
while(w<0)
{
w=w+60;
e--;
b.minute=w;
}
if(e>=0&&e<=23)
b.hour=e;
while(e<0)
{
b.hour=e+24;
}

return b;
}

CTime CTime::operator+=(CTime &c)
{
CTime t;
//int h,m,s;
second+=c.second;
minute+=c.minute;
hour+=c.hour;
while(second>59)
{
second-=60;
minute++;
}
while(minute>59)
{
minute-=60;
hour++;
}
while(hour>23)
{
hour-=24;
}
return *this;
}
CTime CTime::operator-=(CTime &c)
{
CTime t;
int h,m,s;
s=second-c.second;
m=minute-c.minute;
h=hour-c.hour;
if(s>=0)
{
t.second=s;
}
if(s<0)
{
t.second=s+60;
m=m-1;
}
if(m>=0)
{
t.minute=m;
}
if(m<0)
{
t.minute=m+60;
h=h-1;
}
if(h>=0)
{
t.hour=h;
}
if(h<0)
{
t.hour=h+24;
}

return t;
}
int main()
{
int a,b,c,d,m;
CTime t1,t2,t3,t4,t5;
cout<<"请输入t1的时，分，秒："<<endl;
cin>>a>>b>>c;
t1.setTime(a,b,c);
cout<<"请输入t2的时，分，秒："<<endl;
cin>>a>>b>>c;
t2.setTime(a,b,c);
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<<"t1+t2=";
t3=t1+t2;
t3.display();
cout<<"t1-t2=";
t3=t1-t2;
t3.display();
cout<<"请输入增加的秒数："<<endl;
cin>>d;
t4=t1+d;
t4.display();
cout<<"请输入减少的秒数："<<endl;
cin>>m;
t5=t1-m;
t5.display();
t1+=t2;
t1.display();
t1-=t2;
t1.display();
return 0;
}