~cpp
#include <iostream>
#include <climits>
using namespace std;
void output(int , int);
int deter_date(int, int);
int lastdays(int, int);
int how_much_days(int, int);
int main()
{
int year, month;
while (true)
{
cout << " : ";
cin >> year;
cout << " : ";
cin >> month;
if ( !year || !month )
break;
if ( year <= 0 || year >INT_MAX || month <=0 || month>12)
{
cout << " ." << endl;
continue;
}
output(year, month);
}
return 0;
}
void output(int year, int month)
{
int days = how_much_days(year, month);
int date;
if (year%400 != 0)
date = deter_date(year%400, month);
//(?) year%400 year ... ?
//400기 year%400 결.
else
date = deter_date(400, month);
cout << "====================================================" << endl
<< "\t\t\t\t\t금\t" << endl;
for ( int j=0 ; j<date ; j++) // 기
cout << "\t";
for ( int i=0 ; i<days ; i++) //1 days까
{
if ( date > 6 ){ //
cout << endl; // 고
date=0; //
}
cout << i+1 << "\t";
date++; //
}
cout << endl << "====================================================" << endl;
}
int deter_date(int year, int month )// (0 , 6 )
{
if ( month == 0 ){
year--;
month = 12;
}
else if ( year == 1 && month == 1)
return 1; // 1 1
return (lastdays(year,month) + deter_date(year, month-1)) % 7;//
/*
고 거기
. 1 2 경
1 1 31고 (31 + 1) % 7 == 4
.
*/
}
int lastdays(int year, int month)// 계
{
int last;
switch(month)
{
case 3:
if ( year%4 == 0)
{
last = 29;
if ( year%400 == 0 )
last = 29;//
if ( year%4000 == 0 )
last = 28;//
else if ( year%100 == 0 )
last = 28;//
}
else
last = 28;
break;
case 5: case 7: case 10: case 12:
last = 30;
break;
case 1: case 8: case 2:
last = 31;
break;
case 4: case 6: case 9: case 11:
last = 31;
break;
}
return last;
}
int how_much_days(int year, int month)
{
int days;
switch(month)//
{
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
days = 31;
break;
case 2:
if ( year%4 == 0)
{
days = 29;
if ( year%400 == 0 )
days = 29;//경
if ( year%4000 == 0)
days = 28;// 경
else if ( year%100 == 0 )
days = 28;//경
}
else// 경
days = 28;
break;
case 4: case 6: case 9: case 11:
days = 30;
break;
}
return days;
}
