#include"date.h"
Date::Date(int dd, Month mm, int yy)
{
if (yy == 0) yy = default_date.year();
if (mm == 0) mm = default_date.month();
if (dd == 0) dd = default_date.day();
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 Bad_date();
}
if (dd<1 || max<dd) throw Bad_date();
y = yy;
m = mm;
d = dd;
}
Date Date::default_date(1, Month(1), 1970);
int Date::day() const
{
return d;
}
Date::Month Date::month() const
{
return (Month)m;
}
int Date::year() const
{
return y;
}
void Date::set_default(int yy, Month mm, int dd)
{
int max;
switch (mm)
{
case feb:
max = 28 + default_date.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 Bad_date();
}
if (dd<1 || max<dd) throw Bad_date();
default_date.y = yy;
default_date.m = mm;
default_date.d = dd;
}
Date& Date::add_year(int n)
{
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 (12<mm)
{
delta_y++;
mm -= 12;
}
y += delta_y;
m = Month(mm);
return *this;
}
return *this;
}
Date& Date::add_day(int n)
{
while (n>365)
{
if (d <= 28 && m <= 2 && leapyear(y) || leapyear(y + 1))
{
y++;
n -= 366;
}
n -= 365;
}
while (n)
{
switch (m)
{
case jan:
case mar:
case may:
case jul:
case aug:
case oct:
case dec:
if (d + n>31)
{
m++;
if (m>12)
{
m = 1; y++;
}
n -= (32 - d);
d = 1;
}
else
{
d += n;
n = 0;
}
break;
case apr:
case jun:
case sep:
case nov:
if (d + n>30)
{
m++;
n -= (31 - d);
d = 1;
}
else
{
d += n;
n = 0;
}
break;
default:
if (d + n>28 + leapyear(y))
{
m++;
n -= (28 + leapyear(y) + 1 - d);
d = 1;
}
else
{
d += n;
n = 0;
}
}
}
return *this;
}
int Date::leapyear(int yy)
{
if (yy % 400 == 0 || yy % 4 == 0 && yy % 100)
return 1;
return 0;
}
//测试程序
10.6-2.rar （22个子文件） 
10.6-2 
date.h 453B experiment_four.vcxproj.filters 1KB experiment_four.vcxproj 7KB 10.6-2.cpp 391B date.cpp 2KB Debug vc140.pdb 348KB experiment_four.tlog CL.write.1.tlog 2KB CL.read.1.tlog 10KB experiment_four.lastbuildstate 229B unsuccessfulbuild 0B CL.command.1.tlog 1KB link-cvtres.read.1.tlog 2B link.write.1.tlog 2B link-rc.write.1.tlog 2B link-cvtres.write.1.tlog 2B link.command.1.tlog 2B link-rc.read.1.tlog 2B link.read.1.tlog 2B experiment_four.log 324B vc140.idb 315KB 10.6-2.obj 47KB date.obj 14KB资源评论
