OOP/2012년스터디

//
//  main.cpp
//  Calender
//
//  Created by 김 태진 on 12. 1. 10..
//  Copyright (c) 2012년 __MyCompanyName__. All rights reserved.
//

#include <stdio.h>

int isLeapYr(int yr);
int isThirtyOne(int mth);

int main()
{
	int month,day=1,myYear,date=1,monthEndDate;
	int i;
	int Max;
	
	scanf("%d",&myYear);
	
	if(isLeapYr(myYear)==1){
		Max=366;
	}else{
		Max=365;
	}
	
	for(i=1;i<myYear;i++){
		if(isLeapYr(i-1)==1&&i!=1){
			day+=2;
		}else{
			day++;
		}
		//day 0 == 일
	}
	day%=7;
	
	for(month=1;month<=12;month++){
		date=1;
		if(isThirtyOne(month)==1){
			monthEndDate=31;
		}else{
			monthEndDate=30;
			if(month==2){
				monthEndDate=28;
				if(isLeapYr(myYear)==1){
					monthEndDate=29;
				}
			}
		}
		printf("\n%d월\n",month);//몇월
		printf("일\t월\t화\t수\t목\t금\t토\n");
		for(i=0;i<day;i++){
			printf("\t");
		}
		for(;date<=monthEndDate;date++){
			printf("%d\t",date);
			if(i%7==6){
				printf("\n");
			}
			i++;
		}
		day=i%7;
	}

	
	
	return 0;
}

int isLeapYr(int yr){
	
	int flag=0;
	
	if(yr%4==0){
		flag=1;//1이면 윤년
		if(yr%100==0){
			flag=0;
			if(yr%400==0){
				flag=1;
			}
		}
	}
	return flag;
}
int isThirtyOne(int mth){
	if(mth==1||mth==3||mth==5||mth==7||mth==8||mth==10||mth==12){
		return 1;
	}else{
		return 0;
	}
}

#include <iostream>
using namespace std;

void printYear(int year);
void printHeader(int year, int month);
void printMonth(int year, int month);
int accumulatedDays(int year, int month);
int numberOfDays(int year, int month);
int isLeapYear(int year);

int main(){
	int year;

	cin>>year;
	printYear(year);

	return 0;
}

void printYear(int year){
	for(int i = 1; i <= 12; i++){
		printHeader(year, i);
		printMonth(year, i);
	}
}

void printHeader(int year, int month){
	cout<<endl;
	cout<<"\t\t\t"<<year<<"년 "<<month<<"월"<<endl<<endl;
	cout<<"월\t화\t수\t목\t금\t토\t일"<<endl;
}

void printMonth(int year, int month){
	int startDay = accumulatedDays(year, month) % 7;

	for(int i = 1; i <= startDay; i++){
		cout<<"\t";
	}
	
	for(int i = 1; i <= numberOfDays(year, month); i++){
		cout<<i<<"\t";
		if((i + startDay) % 7 == 0){
			cout<<endl;
		}
	}
	cout<<endl;
}

int accumulatedDays(int year, int month){
	int sum = 0;
	
	if(year >= 1){
		sum = (year-1) * 365;
	
		for(int i = 1; i < year; i++){
			sum += isLeapYear(i);
		}

		for(int i = 1; i < month; i++){
			sum += numberOfDays(year, i);
		}
	}	

	return sum;
}

int numberOfDays(int year, int month){
	switch(month){
	case 1: case 3: case 5: case 7: case 8: case 10: case 12:
		return 31;
	case 4: case 6: case 9: case 11:
		return 30;
	case 2:
		return 28 + isLeapYear(year);
	}
}

int isLeapYear(int year){
	return (year % 400 == 0) || ((year % 100 != 0) && (year % 4 == 0));
}