第八周项目2-TIME类中的运算符重载

/*
*程序的版权和版本声明部分：
*Copyright(c)2014，烟台大学计算机学院学生
*All rights reserved.
*文件名称:
*作者：田成琳
*完成日期：2014  年 4 月 15 日
*版本号：v1.0
*对任务及求解方法的描述部分：
*输入描述：无
*问题描述：Time类模板，+，-，+=，-=的重载
*程序输出：- -
*问题分析：
*算法设计：
*/
#include<iostream>
using namespace std;
class CTime
{
private:
int hour;    // 时
int minute;  // 分
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
};
//下面实现所有的运算符重载代码。
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;
}
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)
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;
}
CTime CTime::operator+(CTime &t)
{
int s,m,h;
s=second+t.second;
m=minute+t.minute;
h=hour+t.hour;
while(s>=60)
{
s-=60;
m++;
}
while(m>=60)
{
m-=60;
h++;
}
while(h>=24)
h-=24;
CTime t1(h,m,s);
return t1;
}
CTime CTime::operator-(CTime &t)
{
int s,m,h;
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 t1(h,m,s);
return t1;
}
CTime CTime::operator+(int s)
{
int sec,min,hou;
sec=s%60;
min=(s/60)%60;
hou=s/3600;
CTime t(hou,min,hou);
return *this+t;
}
CTime CTime::operator-(int s)
{
int sec,min,hou;
sec=s%60;
min=(s/60)%60;
hou=s/3600;
CTime t(hou,min,hou);
return *this-t;
}
CTime CTime::operator+=(CTime &t)
{
second+=t.second;
minute+=t.minute;
hour+=t.hour;
while(second>=60)
{
second-=60;
minute++;
}
while(minute>=60)
{
minute-=60;
hour++;
}
while(hour>=24)
hour-=24;
CTime t1(hour,minute,second);
return t1;

}
CTime CTime::operator-=(CTime &t)
{
second-=t.second;
minute-=t.minute;
hour-=t.hour;
while(second<0)
{
second+=60;
minute--;
}
while(minute<0)
{
minute++;
hour--;
}
while(hour<0)
hour+=24;
CTime t1(hour,minute,second);
return t1;
}
CTime CTime::operator+=(int s)
{
second+=s;
while(second>60)
{
second-=60;
minute++;
while(minute>60)
{
minute-=60;
hour++;
}
}
return CTime(hour,minute,second);
}
CTime CTime::operator-=(int s)
{
second-=s;
while(second<0)
{
second+=60;
minute--;
while(minute<0)
{
minute+=60;
hour--;
}
}
return CTime(hour,minute,second);
}
void CTime::display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
int main()
{
CTime t1(8,20,25),t2(11,20,50),t;
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;
t=t1+t2;
t.display();
t=t1-t2;
t.display();
t=t1+2000;
t.display();
t=t1-5000;
t.display();
t1+=t2;
t1.display();
t1-=t2;
t1.display();
t1+=2000;
t1.display();
t1-=5000;
t1.display();
return 0;
}