Time类的运算符重载

来源：互联网发布：刘国梁离任真相知乎编辑：程序博客网时间：2024/05/14 03:01

#include <iostream>
#include <string>
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();
//重载输入输出运算符
friend istream &operator>>(istream &in,CTime &t);
friend ostream &operator<<(ostream &out,CTime t);
//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
};
//构造函数
CTime::CTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
}
//设置时间
void CTime::setTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
}
//二目的比较运算符重载
bool CTime::operator > (CTime &t)
{
if(hour>t.hour)return true;
if(hour<t.hour)return false;
if(minute>t.minute)return true;
if(minute<t.minute)return false;
if(second>t.second)return true;
return false;
}
bool CTime::operator < (CTime &t)
{
if (hour<t.hour) return true;
if (hour>t.hour) return false;
if (minute<t.minute) return true;
if (minute>t.minute) return false;
if (second<t.second) return true;
return false;
}
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;
}
bool CTime::operator <= (CTime &t)
{
if(*this>t)return false;
return true;
}
bool CTime::operator != (CTime &t)
{
if(*this==t)return false;
return true;
}
//二目的加减运算符的重载
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-=24;
CTime t0(h,m,s);
return t0;
}
CTime CTime::operator-(CTime &t)//对照+理解
{
int h,m,s;
h=hour-t.hour;
m=minute-t.minute;
s=second-t.second;
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
{
int ss=s%60;
int mm=(s/60)%60;
int hh=s/3600;
CTime t0(hh,mm,ss);
return *this+t0;
}
CTime CTime::operator-(int s)//返回s秒前的时间
{
int ss=s%60;
int mm=(s/60)%60;
int hh=s/3600;
CTime t0(hh,mm,ss);
return *this-t0;
}
CTime CTime::operator++(int )//后置++，下一秒
{
CTime t;
t=*this;
*this=*this+1;
return t;
}
CTime &CTime::operator++()//前置++，下一秒
{
*this=*this+1;
return *this;
}
CTime CTime::operator--( int)//后置--，前一秒
{
CTime t;
t=*this;
*this=*this-1;
return t;
}
CTime &CTime::operator--()//前置--，前一秒
{
*this=*this-1;
return *this;
}
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;
}
istream &operator>>(istream &in,CTime &t)
{
char ch1,ch2;
while(1)
{
cout<<"请输入时间（hh:mm:ss）"<<endl;
cin>>t.hour>>ch1>>t.minute>>ch2>>t.second;
if(ch1==':'&&ch2==':')
if(t.hour>-1&&t.hour<24&&t.minute>1&&t.minute<60&&t.second>-1&&t.second<60) break;
cerr<<"时间格式输入错误！"<<endl;
}
return cin;
}
ostream &operator<<(ostream &out,CTime t)
{
cout<<t.hour<<":"<<t.minute<<":"<<t.second<<endl;
return out;
}
int main()
{
CTime t1,t2,t;
cout<<"t1为：";
cin>>t1;
cout<<"t2为：";
cin>>t2;
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<<endl;
cout<<"t2= "<<t2<<endl;
cout<<"t=t1++"<<endl;
t=t1++;
cout<<"t= "<<t<<" t1= "<<t1<<endl;
cout<<"t=++t1"<<endl;
t=++t1;
cout<<"t= "<<t<<" t1= "<<t1<<endl;
cout<<"t1+t2= "<<t1+t2<<endl;
cout<<"t1-t2= "<<t1-t2<<endl;
cout<<"t1+2000= "<<t1+2000<<endl;
cout<<"t1-5000= "<<t1-5000<<endl;
return 0;
}

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