自学教程：C++ IsLeapYear函数代码示例

int DateTime::DayOfYear() const{    int year, month, day;    GetDateFromTimeValue( Value(), year, month, day);    const unsigned* monthTable = IsLeapYear(year) ? monthStartLeap : monthStart;    return monthTable[ month - 1 ] + day;}

int TDateTime::IsLeapYear(){	unsigned  int year=0;	unsigned  int month=0;	unsigned  int day=0;	DecodeDate(year, month, day);		return IsLeapYear(year);}

 static double DayFromMonth(double year, double month) {     int iMonth = (int) MathUtils::floor(month);     if (iMonth < 0 || iMonth >= 12) {         return MathUtils::kNaN;     }     return DayFromYear((int)year) + kMonthOffset[(int)IsLeapYear((int)year)][iMonth]; }

	int Date::DayOfYear(int year, int month, int day)	{		static const int DAYS_BEFORE[2][13] = {			{ -1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 },			{ -1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 }		};		return DAYS_BEFORE[IsLeapYear(year)][month] + day - 1;	}

	int Date::DaysInMonth(int year, int month)	{		static const int DAYS_IN_MONTH[2][13] = {			{ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },			{ 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }		};		return DAYS_IN_MONTH[IsLeapYear(year)][month];	}

Calendar Calendar::GetAfterTwoMonthDay() const {	if (this->Month == 12) {		if (!IsLeapYear(this->Year + 1)) return this->Day >= 28 ? Calendar(this->Year + 1, 2, 28) : Calendar(this->Year + 1, 2, this->Day);		else return this->Day >= 29 ? Calendar(this->Year + 1, 2, 29) : Calendar(this->Year + 1, 2, this->Day);	}	else if (this->Month == 11) return Calendar(this->Year + 1, 1, this->Day);	else if (this->Month == 7 && this->Day == 31) return Calendar(this->Year, 9, 30);	else return Calendar(this->Year, this->Month + 2, this->Day);}

Calendar Calendar::GetAfterAWeekDay() const {	auto AfterAWeekDate = [this](const int AbleToSimpleAddBorderDay) { 		return this->Day <= AbleToSimpleAddBorderDay ? Calendar(this->Year, this->Month, this->Day + 7) : Calendar(this->Year, Month + 1, this->Day - AbleToSimpleAddBorderDay);	};	if (this->Month == 12 && this->Day > 24) return Calendar(this->Year + 1, 1, this->Day - 24);	else if (!IsNo31Month(this->Month)) return AfterAWeekDate(24);	else if (this->Month != 2) return AfterAWeekDate(23);	else return AfterAWeekDate((IsLeapYear(this->Year) ? 22 : 21));}

int32 FDateTime::DaysInYear( int32 Year ){	if (IsLeapYear(Year))	{		return 366;	}	return 365;}

void NextDay(){day++;if(day>DayOfMonth[month][IsLeapYear(year)]){day=1;month++;}if(month>12){month=1;year++;}}

STATICBOOLEANValidDay (  IN  EFI_TIME  time  ){  if (time.Day > DayOfMonth[time.Month - 1]) {    return FALSE;  }  //  // Pay attention to month==2  //  if (time.Month == 2 && ((IsLeapYear (time) && time.Day > 29) || (!IsLeapYear (time) && time.Day > 28))) {    return FALSE;  }  return TRUE;}

//	////////////////////////////////////////////////////////////////////////////inline unsigned int MonthDayMax(unsigned int in_year, unsigned int in_month){	return((!YearMonthOk(in_year, in_month)) ? 0 :		(((in_month == 1) || (in_month == 3) ||		(in_month == 5) || (in_month == 7) || (in_month == 8) ||		(in_month == 10) || (in_month == 12)) ? 31 : ((in_month == 4) ||		(in_month == 6) || (in_month == 9) || (in_month == 11)) ? 30 :		(28 + ((IsLeapYear(in_year)) ? 1 : 0))));}

STATICBOOLEANEFIAPIIsDayValid (  IN  EFI_TIME  *Time  ){  ASSERT (Time->Day >= 1);  ASSERT (Time->Day <= mDayOfMonth[Time->Month - 1]);  ASSERT (Time->Month != 2 || IsLeapYear (Time) || Time->Day <= 28);  if (Time->Day < 1 ||      Time->Day > mDayOfMonth[Time->Month - 1] ||      (Time->Month == 2 && !IsLeapYear (Time) && Time->Day > 28)) {    return FALSE;  }  return TRUE;}

int CMyCalendar::MonthDays(int year,int month){	if(month==2)	{		if(IsLeapYear(year))			return 29;		return 28;	}	return sMonthDays[month];}

unsigned CTimer::GetDaysOfMonth (unsigned nMonth, unsigned nYear){	if (   nMonth == 1	    && IsLeapYear (nYear))	{		return 29;	}	return s_nDaysOfMonth[nMonth];}

//returns the length of any month, ie length of November would be 30int cTimeAndDate::LengthOfMonth(int month) const {        int ret=-1;	switch(month) { 		case 9: case 4: case 6: case 11: ret=30; break;   		case 1: case 3: case 5: case 7: case 8: case 10: case 12: ret=31; break;		case 2: if(IsLeapYear()) ret=29; else ret=28; break;  		default: ret=-1; //invalid month    	}     	return ret;}

/****************************************************************************** *  RtlTimeFieldsToTime		[[email
C++ IsLinked函数代码示例
C++ IsLeaf函数代码示例