kopriths

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
int chday(int day,int month,int year);
int chmonth(int month);
int chyear(int year);
int leapYear(int y);
int day_of_year(int d,int m,int y);

int chday(int day,int month,int year) {