#include<stdio.h>
#include<stdlib.h>

int main(){
	int Week1OfYear=1;
	int year;
	int month;
	int day;
	int c;
	//**********************************************
	//Week1OfYear:	week of 1/1 in the year
	//year:			year,for dmetermine Week1OfYear
	//month:		month,a number for a loop
	//day:			day,range of day
	//c:			to count "day"
	//**********************************************
	while(1){
		printf("Pleast enter year(2001~2010)\n");
		scanf("%d",&year);
		if(year<2001||year>2010){
			printf("Error!Please enter again!!!\n");
			continue;
		}
		else{
			break;
		}
	}
	//**********************************************
	//input a number year
	//test year if it's not from 2001 to 2010 then
	//continue this loop
	//if it's correct then break this loop
	//**********************************************
	if(year<=2004){
		Week1OfYear = (year-2000)%7;
	}
	else if(year>2004&&year<=2008){
		Week1OfYear = (year-2000+1)%7;
	}
	else{
		Week1OfYear = (year-2000+1+1)%7;
	}

	if(Week1OfYear==0){
		Week1OfYear = 7;
	}
	//**********************************************
	//count week of 1/1
	//if it's leap year then week of 1/1 must +1
	//similarly,if there is to leap year before the
	//then +2
	//**********************************************


	//loop for month
	for(month=1;month<=12;month++){
		//define days for whitch month
		if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
			day = 31;
		}
		else if(month==4||month==6||month==9||month==11){
			day = 30;
		}
		else{
			//count if it's a leap year
			if(year%4==0&&year%100!=0||year%400==0)
				day = 29;
			else
				day = 28;
		}


		//print format of monthly calendar
		printf("------------------------- %d -------------------------\n",month);
		printf("Mon\tTue\tWed\tThur\tFri\tSat\tSun\n");
		for(c=1;c<Week1OfYear;c++){
			printf("\t");
		}
		for(c=1;c<=day;c++){
			printf("%d\t",c);//printf days from 1 to end of month
			if((c+Week1OfYear)%7==1){//while (c+first week of day)'s remainder of 7 is 1 then print newline~
				printf("\n");
			}
		}
		printf("\n\n");//just for typesetting


		if((Week1OfYear+day)%7==0)//if it's Sunday(7 can be divisible，so we need to fix it)
			Week1OfYear=7;
		else
			Week1OfYear = (Week1OfYear+day)%7;//obtain the week of next month's first day
	}//loop,month+1
	system("PAUSE");
	return 0;
}