程序代码：main.cpp:::
#include <iostream>
#include <string>
#include "Date.h"
using namespace std;
int main() {
Date d(2008, 8, 8);
d.Print();
cout << d.Date2Days() << endl;
d = Date::Days2Date(d.Date2Days());
d.Print();
d = Date::Days2Date(2000);
d.Print();
cout << d.toString("MM/dd/yyyy") <<endl;
cout << d.nthDay() << endl;
cout << d.nthWeek() <<endl;
d.NextDate().Print();
d.PrevDate().Print();
cout << d.DiffDate(Date::Today()) << endl;
d.AfterNDays(100).Print();
cout << d.Equal(Date::Today()) << endl;
cout << d.Earlier(Date::Today()) << endl;
}
Date.h:::#ifndef DATE_CLASS
#define DATE_CLASS
#include <iostream>
#include <string>
using namespace std;
class Date {
private:
int year, month, day;
private:
enum {YearBase = 1970};
enum {MonthBase = 1};
enum {DayBase = 1};
static int nDaysofMonth[13];
void LeapYearEnabled() const;
public:
Date(int y = YearBase, int m = MonthBase, int d = DayBase);
Date(const Date& d);
Date& operator = (const Date& rhs);
void SetDate(int y, int m, int d);
void Print() const;
static bool IsLeapYear(int y);
static int DaysOfThisYear(int y);
int Date2Days() const;
static Date Days2Date(int n);
string toString(string format_flag) const;
static Date Today();
int nthDay() const;
int nthWeek() const;
Date NextDate() const;
Date PrevDate() const;
int DiffDate(const Date& d) const;
Date AfterNDays(int n) const;
bool Equal(const Date& d) const;
bool Earlier(const Date& d) const;
};
#endif
程序代码：Date.cpp:::
#include <iostream>
#include <stdio.h>
#include <cassert>
#include <time.h>
#include "Date.h"
using namespace std;
int Date::nDaysofMonth[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
Date::Date(int y, int m, int d) {
SetDate(y, m, d);
}
Date::Date(const Date& d) {
if(this != &d) {
year = d.year;
month = d.month;
day = d.day;
}
}
Date& Date::operator = (const Date& rhs) {
if(this != &rhs) {
year = this->year;
month = this->month;
day = this->day;
}
return *this;
}
void Date::SetDate(int y, int m, int d) {
year = y >= YearBase ? y : YearBase;
month = m >= 1 && m <= 12 ? m : MonthBase;
this->LeapYearEnabled();
day = d >= 1 && d <= nDaysofMonth[month] ? d : DayBase;
}
void Date::LeapYearEnabled() const {
if(IsLeapYear(year))
nDaysofMonth[2] = 29;
else
nDaysofMonth[2] = 28;
}
void Date::Print() const {
cout << this->year << "-" << this->month
<< "-" << this->day << endl;
}
bool Date::IsLeapYear(int y) {
return (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0);
}
int Date::DaysOfThisYear(int y) {
if(IsLeapYear(y)) return 366;
else return 365;
}
int Date::Date2Days() const {
this->LeapYearEnabled();
int s = 0;
s += day;
for(int m = 1; m < month; ++m)
s += nDaysofMonth[m];
for(int y = YearBase; y < year; ++y)
s += DaysOfThisYear(y);
return s;
}
Date Date::Days2Date(int n) {
Date d;
int y = YearBase;
while(n >= DaysOfThisYear(y)) {
n -= DaysOfThisYear(y);
++y;
if(n == DaysOfThisYear(y))
break;
}
d.year = y;
d.LeapYearEnabled();
int m = 1;
while(n >= nDaysofMonth[m]) {
n -= nDaysofMonth[m];
++m;
if(n == nDaysofMonth[m])
break;
}
d.month = m;
d.day = n;
return d;
}
string Date::toString(string format_flag) const {
int length = format_flag.size();
char *a = new char;
if(length == 6) {sprintf(a, "%s/%s/%s", month, day, year);}
if(length == 10) {sprintf(a, "%02s/%02s/%04s", month, day, year);}
if(length == 12) {
switch(month) {
case 1 : sprintf(a, "January %02s,%04s", day, year); break;
case 2 : sprintf(a, "Febrary %02s,%04s", day, year); break;
case 3 : sprintf(a, "March %02s,%04s", day, year); break;
case 4 : sprintf(a, "April %02s,%04s", day, year); break;
case 5 : sprintf(a, "May %02s,%04s", day, year); break;
case 6 : sprintf(a, "June %02s,%04s", day, year); break;
case 7 : sprintf(a, "July %02s,%04s", day, year); break;
case 8 : sprintf(a, "Augest %02s,%04s", day, year); break;
case 9 : sprintf(a, "September %02s,%04s", day, year); break;
case 10 : sprintf(a, "October %02s,%04s", day, year); break;
case 11 : sprintf(a, "November %02s,%04s", day, year); break;
case 12 : sprintf(a, "December %02s,%04s", day, year); break;
}
}
return string((string)a);
}
Date Date::Today() {
time_t timer;
time(&timer);
tm* t_tm = localtime(&timer);
return Date(t_tm->tm_year, t_tm->tm_mon, t_tm->tm_mday);
}
int Date::nthDay() const {
Date now;
now = now.Today();
LeapYearEnabled();
int sum = 0;
sum += day;
for(int m = 1; m <= month; m++)
sum += nDaysofMonth[m];
return sum;
}
int Date::nthWeek() const {
int sum(nthDay());
return (sum / 7 + 1);
}
Date Date::NextDate() const {
int sum(Date2Days() + 1);
return Days2Date(sum);
}
Date Date::PrevDate() const {
int sum(Date2Days() - 1);
return Days2Date(sum);
}
int Date::DiffDate(const Date& d) const {
int sum1(Date2Days());
int sum2(d.Date2Days());
return (sum1 - sum2) > 0 ? (sum1 - sum2) : (sum2 - sum1);
}
Date Date::AfterNDays(int n) const {
int sum(Date2Days() + n);
return Days2Date(sum);
}
bool Date::Equal(const Date& d) const {
if(year == d.day && month == d.month && day == d.day) return true;
else return false;
}
bool Date::Earlier(const Date& d) const {
if(year < d.year || (year == d.year && month < d.month) ||
(year == d.year && month == d.month && day < d.day)) return true;
else return false;
}
