//?Fig.?11.13:?Date.cpp
//?Date?class?member?function?definitions.
#include?
#include?“Date.h“

//?initialize?static?member?at?file?scope;?one?classwide?copy
const?int?Date::days[]?=?
	{?0?31?28?31?30?31?30?31?31?30?31?30?31?};

//?Date?constructor
Date::Date（int?m?int?d?int?y）
{
	setDate（?m?d?y?）;
}?//?end?Date?constuctor

//?set?month?day?and?year
void?Date::setDate（?int?mm?int?dd?int?yy?）
{
	month?=?（?mm?>=?1?&&?mm?<=?12?）???mm?:?1;
	year?=?（?yy?>=?1900?&&?yy?<=?2100?）???yy?:?1900;

	//?test?for?a?leap?year
	if?（?month?==?2?&&?leapYear（?year?）?）
		day?=?（?dd?>=?1?&&?dd?<=?29?）???dd?:?1;
	else
		day?=?（?dd?>=?1?&&?dd?<=?days[?month?]?）???dd?:?1;
}?//?end?function?setDate

//?overloaded?prefix?increment?operator
Date?&Date::operator++（）
{
	helpIncrement（）;?//?increment?date
	return?*this;?//?reference?return?to?create?an?lvalue
}?//?end?function?operator++

//?overloaded?postfix?increment?operator;?note?that?the
//?dumy?integer?parameter?does?not?have?a?parameter?name
Date?Date::operator++（?int?）
{
	Date?temp?=?*this;?//?hold?current?state?of?object
	helpIncrement（）;

	//?return?unincremented?saved?temporary?object
	return?temp;?//?value?return;?not?a?reference?return
}?//?end?function?operator++

//?add?specified?number?of?days?to?date
const?Date?&Date::operator?+=（?int?additionalDays?）
{
	for?（?int?i?=?0;?i?		helpIncrement（）;

	return?*this;?//?enables?cascading
}?//?end?function?operator+=

//?if?the?year?is?a?leap?year?return?true;?otherwise?return?false
bool?Date::leapYear（?int?testYear?）?const
{
	if?（?testYear?%?400?==?0?||
		（?testYear?%?100?!=?0?&&?testYear?%?4?==?0）?）
		return?true;?//?a?leap?year
	else
		return?false;?//?not?a?leap?year
}?//?end?function?leapYear

//?determine?whether?the?day?is?the?last?day?of?the?month
bool?Date::endOfMonth（?int?testDay?）?const
{
	if?（?month?==?2?&&?leapYear（?year?）?）
		return?testDay?==?29;?//?last?day?of?Feb.?in?leap?year
	else
		return?testDay?==?days[?month?];
}?//?end?function?endOfMonth

//?function?to?help?increment?the?date
void?Date::helpIncrement（）
{
	//?day?is?not?end?of?month
	if?（?!endOfMonth（?day?）?）
		day++;?//?increment?day
	else?//?last?day?of?year
	{
		year++;?//?increment?year
		month?=?1;?//?first?month?of?new?year
		day?=?1;?//?first?day?of?new?month
	}?//?end?else
}?//?end?function?helpIncrement

//?overload?output?operator
ostream&?operator<<（ostream&?output?const?Date?&d）
{
	static?char?*monthName[?13?]?=?{?““?“January“?“Februray“
		“March“?“April“?“May“?“June“?“July“?“August“
		“September“?“Oectober“?“November“?“December“?};

	output?<	return?output;?//?enables?cascading
}?//?end?function?operator<<

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????505??2008-05-05?20:31??ex0601.cpp

?????文件????????614??2008-05-07?06:09??prime.cpp

?????文件????????271??2008-05-07?06:09??prime.h

?????文件?????????16??2008-04-27?16:08??prime.txt

-----------?---------??----------?-----??----

?????????????????1406????????????????????4