类的

//Data.h

#include iostream

#include string

using namespace std;

class Date

{

public:

enum Month { jan = 1, feb, mar, apr, may, jun,

jul, aug, sep, oct, nov, dec };

class BadDate{ };

Date(int dd = 0, Month mm = Month(0), int yy = 0);

int day( ) const;

Month month( ) const;

int year( ) const;

//string string_rep( ) const;

//void char_rep(char s[]) const;

void print_date( );

//使用Date之前应调用set_default函数设置缺省日期

static void set_default(int, Month, int);

Date add_year(int n);

Date add_month(int n);

Date add_day(int n);

private:

int d;

Month m;

int y;

static Date default_date;

int get_days(Month mm);

};

int leapyear(int yy);

//p

#include \"Date.h\"

Date::Date(int dd, Month mm, int yy)

{

if(yy == 0)

y = default_ar( );

if(mm == Month(0))

m = default_nth( );

if(dd == 0)

d = default_y( );

int max;

switch(mm)

{

case feb:

max = 28 + leapyear(yy);

break;

case apr:

case jun:

case sep:

case nov:

max = 30;

break;

case jan:

case mar:

case may:

case jul:

case aug:

case oct:

case dec:

max = 31;

break;

default:

throw BadDate( );

}

if(dd 1 || dd max)

throw BadDate( );

y = yy;

m = mm;

d = dd;

}

int Date::day( ) const

{

return d;

}

enum Date::Month Date::month( ) const

{

return m;

}

int Date::year( ) const

{

return y;

}

void Date::set_default(int d, Month m, int y)

{

default_date = Date(d, m, y);

}

Date Date::add_year(int n)

{

if(n != 0)

{

if( d == 29 m == feb !leapyear(y + n) )

{

d = 28;

}

y = y + n;

}

return *this;

}

Date Date::add_month(int n)

{

if(n == 0)

return *this;

if(n 0)

{

int delta_y = n/12;

int mm = m + n%12;

if(mm 12)

{

delta_y++;

mm -= 12;

}

y += delta_y;

if(mm == 2 d 28)

{

if( leapyear(y) )

d = 29;

else

d = 28;

}

if(d == 31)

{

if( (mm == apr) || (mm == jun)

(mm == sep) || (mm == nov) )

{

d = 30;

}

}

m = Month(mm);

return *this;

}

if(n 0)

{

n = -n;

int delta_y = n/12;

int mm = m - n%12;

if(mm = 0)

{

delta_y++;

mm += 12;

}

y -= delta_y;

if(mm == 2 d 28)

{

if( leapyear(y) )

d = 29;

else

d = 28;

}

if(d == 31)

{

if( (mm == apr) || (mm == jun)

(mm == sep) || (mm == nov) )

{

d = 30;

}

}

m = Month(mm);

return *this;

}

return *this;

}

Date Date::add_day(int n)

{

if( n == 0 )

return *this;

if( n 0 )

{

//计算本月剩余天数

int totalDays = get_days(m);

int daysLeft = totalDays - d;

if(n = daysLeft)

{

d = d + n;

}

else if(n daysLeft)

{

//把日期调整到下个月1号

n = n - (daysLeft + 1);

add_month(1);

d = 1;

//模拟时间按月的流逝，最后得到正确的日期

int daysInMonth = get_days(m);

while( n = daysInMonth )

{

add_month(1);

n = n - daysInMonth;

daysInMonth = get_days(m);

}

d = d + n;

}

}

else if( n 0 )

{

//把n变为正值

n = -n;

//计算本月剩余天数

int totalDays = get_days(m);

int daysLeft = totalDays - d;

//把时间调整到本月的最后一天

n = n + daysLeft;

d = d + daysLeft;

//模拟时间按月的倒流，最后得到正确的日期

int daysInMonth = get_days(m);

在马栏河旁的景观式排水口 while( n = daysInMonth )

{

add_month(-1);

n = n - daysInMonth;

daysInMonth = get_days(m);

}

d = d - n;

}

return *this;

}

int Date::get_days(Month mm)

{

int days;

if(mm == 0)

return 0;

switch(mm)

{

case jan:

case mar:

case may:

case jul:

case aug:

case oct:

case dec:

days = 31;

break;

case apr:

case jun:

case sep:

case nov:

days = 30;

break;

case feb:

days = 28 + leapyear(y);

}

return days;

}

void Date::print_date( )

{

couty\'-\'m\'-\'dendl;

}

int leapyear(int yy)

{

int iRet = 0;

if( (yy % 4 == 0) (yy % 100 != 0) )

iRet = 1;

if( yy % 400 == 0 )

iRet = 1;

return iRet;

}

Date Date::default_date(3, feb, 1981);

int main( )

{

//Date::set_default();

Date testDate(29, Date::Month::feb, 2000);

int_date( );

cout\"after add -1 years:\";

d_year(-1);

int_date( );

system(\"pause\");

return 0;

}

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