#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;
class Date
{
friend void PrintDate(int year, int month); //友元函数
public:
Date(int year=2016,int month=1,int day=1) //初始化列表的方式
:_year(year)
,_month(month)
,_day(day)
{
if (month > 12 || day > InitDay(*this))
{
cout<<"输入日期不合法"<<endl;
}
}
Date(const Date& d)
:_year(d._year)
,_month(d._month)
,_day(d._day)
{}
Date& operator=(const Date& d);
public:
void Display()
{
cout<<_year<<"-"<<_month<<"-"<<_day<<endl;
}
Date operator+(int day); //日期加减天数
Date operator-(int day);
int operator-(const Date& d); //日期减日期
bool operator==(const Date& d); //运算符重载
bool operator>(const Date& d);
bool Date::operator<(const Date& d);
private:
bool JudgeLeap(int year); //检查闰年
int InitDay(const Date& d); //计算该日期中当月的天数
private:
int _year;
int _month;
int _day;
};
void PrintDate(int year, int month); //打印日历#define _CRT_SECURE_NO_WARNINGS 1
#include"Date.h"
Date Date::operator+(int day)
{
int tmp=0;
Date d(*this);
while(day > 0)
{
if(d._month == 13)
{
//如果是13月则直接跳入下一年
d._year++;
d._month = 1;
}
tmp=InitDay(d)-d._day; //该月剩余的天数
if(d._day+day > InitDay(*this))
{
//要加的天数大于该月剩余的天数
day -= tmp;;
d._month++;
d._day = 0;
}
else
{
//要加的天数小于该月剩余的天数
d._day += day;
day = 0;
}
}
return d;
}
Date Date::operator-(int day) //类似日期加天数
{
Date d(*this);
while(day > 0)
{
if(d._month == 0)
{
//如果是下标为0的元素直接到前一年
d._year--;
d._month = 12;
}
if(d._day-day <= 0)
{
d._month--;
day -= d._day;
d._day = InitDay(d);
}
else
{
d._day -= day;
day = 0;
}
}
return d;
}
int Date::operator-(const Date& d)
{
int day = 0; //用于统计日期之间相差的天数
Date small(d);
Date large(*this);
//large指向大日期，small指向小日期
if ((!(*this > d))) //<=
{
small = *this;
large = d;
}
while (small._year < large._year) //不同年的情况
{
if (JudgeLeap(small._year)) //是闰年
{
day += 366;
}
else
{
day += 365;
}
small._year++;
while (small._month > large._month)
{
day -= InitDay(small);
small._month--;
}
}
while (small._month < large._month) //同年不同月
{
day += InitDay(small);
small._month++;
}
day += (large._day - small._day); //同年同月直接相减天数
if ((!(*this < d))) //可能出现相减为负数的情况 >=
return day;
return 0-day;
}
bool Date::JudgeLeap(int year) //检查该年是否为闰年
{
if(_year%4 == 0 && _year%100 != 0 || _year%400 == 0)
return true; //是闰年
return false;
}
int Date::InitDay(const Date& d) //初始化该年的每月的天数
{
//浪费掉下标为0的位置
int day[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
if(JudgeLeap(d._year))
{
day[2] = 29;
}
return day[d._month];
}
static int CountWeek(int year, int month)//计算要求月的第一天是星期几
{
if (year >= 1600 && month >= 1)
{
int week = 6;//1600.1.1 为周六(设置日期原点)
int day = 0;
Date d1(1600,1,1);
Date d2(year, month, 1);
day=d2-d1;//统计目标月份的第一天与日期原点相差多少天
week = day%7+week;
if (week > 7)
{
week -= 7;
}
return week;
}
return -1; //当要求日历的年份月份小于1600.1.1时不做处理
}
void PrintDate(int year, int month) //打印日历
{
int day=1;
int i=0,j=0;
int week = CountWeek(year, month);
if(week != -1)
{
cout<<year<<"年"<<month<<"月"<<endl;
cout<<"日"<<" 一"<<" 二"<<" 三"<<" 四"<<" 五"<<" 六"<<endl;
Date d(year,month,1);
for (;i < week; i++)
{
cout<<" ";
}
for (j = 0; j < 6; j++) //j控制最多输出多少行
{
for (; i < 7; i++) //i控制每行输出日期的个数
{
if (day <= d.InitDay(d))
{
printf("%2d ",day);
day++;
}
else
break;
}
i = 0;
cout << endl;
}
}
else
{
cout<<"您的输入有误，不可计算此日历"<<endl;
return ;
}
}
bool Date::operator==(const Date& d)
{
return _year == d._year &&
_month == d._month &&
_day == d._day;
}
bool Date::operator>(const Date& d)
{
if (_year > d._year)
{
return true;
}
else if (_year == d._year)
{
if (_month > d._month)
{
return true;
}
else if (_month == d._month)
{
if (_day > d._day)
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
else
{
return false;
}
}
Date& Date::operator=(const Date& d)
{
if(*this == d)
{
return *this;
}
this->_year=d._year; //当(*this != d)时执行，可进行连续赋值
this->_month=d._month;
this->_day=d._day;
return *this;
}
bool Date::operator<(const Date& d)
{
if (_year < d._year)
{
return true;
}
else if (_year == d._year)
{
if (_month < d._month)
{
return true;
}
else if (_month == d._month)
{
if (_day < d._day)
{
return true;
}
else
{
return false;
}
}
else
{
return false;
}
}
else
{
return false;
}
} #define _CRT_SECURE_NO_WARNINGS 1
#include "Date.h"
void test1() //日期加减天数
{
Date d1(2016,8,6);
d1.Display();
////Date d2=d1+24;
////Date d2=d1+80;
//Date d2=d1+501;
//d2.Display();
////2016-8-30 2016-10-25 2017-12-19
Date d2=d1-80;
d2.Display(); //2016-5-18
}
void test2() //日期减日期
{
int day = 0;
Date d1(2016,8,6);
//Date d2(2016,8,31);
Date d2(2016,10,5);
//Date d2(2017,10,1);
day=d2-d1;
cout<<"相差:"<<day<<"天"<<endl;//25 60 421
}
void test3()
{
Date d1(2016,8,6);
Date d2(d1);
Date d3(2016,9,5);
//cout<<(d1 == d2)<<endl; //1 ==
//cout<<(d1 == d3)<<endl; //0 ==
//cout<<(!(d1 == d2))<<endl; //0 !=
d1.Display(); //2016-8-6
d1=d3;
d1.Display(); //2016-9-5
cout<<(d1 < d2)<<endl; //0 <
cout<<(!(d1 < d2))<<endl; //1 >=
cout<<(d1 > d3)<<endl; //0 >
cout<<(!(d1 > d3))<<endl; //1 <=
}
void test4()
{
int year=0,month=0;
cin>>year>>month;
PrintDate(year,month);
}
int main()
{
//test1();
//test2();
//test3();
test4();
system("color 03");
system("pause");
return 0;
} 原文：http://blog.csdn.net/qq_34328833/article/details/52141106