time类

#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);

//输入输出运算的重载

friend istream &operator>>(istream &in,CTime &t);

friend ostream &operator<<(ostream &out,CTime t);

//比较运算符(二目)的重载

bool operator > (CTime &t);

bool operator < (CTime &t);

bool operator >= (CTime &t);

bool operator <= (CTime &t);

bool operator == (CTime &t);

bool operator != (CTime &t);

//二目运算符的重载

CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15

CTime operator-(CTime &c);//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

//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

//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

};

//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;

}

// 重载输入运算符>>

istream &operator>>(istream &in,CTime &t)

{

char ch1,ch2;

while(1)

{

cout<<"请输入时间(hh:mm:ss) ";

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<<"时间格式不正确! 请重新输入\n";

}

return cin;

}

// 重载输出运算符<<

ostream &operator<<(ostream &out,CTime t)

{

out<<t.hour<<':'<<t.minute<<':'<<t.second;

return out;

}

//比较运算符的重载

bool CTime::operator > (CTime &t) // 判断时间t1>t2

{

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)// 判断时间t1<t2

{

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)// 判断时间t1==t2

{

if (*this<t || *this>t) return false;

return true;

}

bool CTime::operator != (CTime &t) // 判断时间t1!=t2

{

if (*this==t) return false;

return true;

}

bool CTime::operator >= (CTime &t)// 判断时间t1>=t2

{

if (*this<t) return false;

return true;

}

bool CTime::operator <= (CTime &t) // 判断时间t1<=t2

{

if (*this>t) return false;

return true;

}

//二目运算符的重载

// 计算时间之和, 返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15

CTime CTime::operator + (CTime &t)

{

int h,m,s;

s=second+t.second;

m=minute+t.minute;

h=hour+t.hour;

if (s>59)

{

s-=60;

m++;

}

if (m>59)

{

m-=60;

h++;

}

while (h>23) h-=24;

CTime t0(h,m,s);

return t0;

}

//返回s秒后的时间

CTime CTime::operator+(int s)

{

int ss=s%60;

int mm=(s/60)%60;

int hh=s/3600;

CTime t0(hh,mm,ss);

return *this+t0;

}

// 计算时间之差

CTime CTime::operator - (CTime &t)

{

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;

}

//返回s秒前的时间

CTime CTime::operator-(int s)

{

int ss=s%60;

int mm=(s/60)%60;

int hh=s/3600;

CTime t0(hh,mm,ss);

return *this-t0;

}

//一目运算符的重载

CTime CTime::operator++(int)//后置++，下一秒

{

CTime 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=*this;

*this=*this-1;

return t;

}

CTime &CTime::operator--()//前置--，前一秒

{

*this=*this-1;

return *this;

}

//赋值运算符的重载

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;

}

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;

}