Calendar done.c

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

int get_1st_weekday(int year){
	
	int day_zero;
	
	day_zero = (((year - 1) * 365) + ((year - 1) / 4) - ((year - 1) / 100) + ((year) / 400) + 1) % 7;
	
	return day_zero;

}

int main (){
	
	int year,month,day,daysinmonth,weekday=0,startday;
	
	system ("Color E0");
	printf("\nTo access the calendar, enter the year you would like to display : ");
	scanf("%d", &year);
	if((year%4==0 && year%100!=0) || year%400==0){
	printf("\n-----------CALENDAR OF %d------------", year);
	printf("\n----------(L E A P - Y E A R)----------");
	}
	else{
		printf("\n----------CALENDAR OF %d----------", year);
	}
	
	char *months[]={"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
	int  monthdays[]={31,28,31,30,31,30,31,31,30,31,30,31};
	
	if((year%4==0 && year%100!=0) || year%400==0)
		monthdays[1]=29;
	
	
	startday = get_1st_weekday(year); 
	for(month=0;month<12;month++){
		
		daysinmonth=monthdays[month];
		printf("\n\n              %s\n", months[month]);
		printf("\n Sun  Mon  Tue  Wed  Thurs  Fri  Sat\n");
		
			for(weekday=0;weekday<startday;weekday++){
				printf("     ");
			}
			
		for(day=1;day<=daysinmonth;day++){
			printf("%5d", day);
			
			if(++weekday>6){
			printf("\n");
			weekday=0;
		}
		startday = weekday;
		}
	}
	
	
	return 0;
}