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/****************************************************************************
 * Obliczanie daty Tłustego Czwartku                                        *
 * 2015, Tymoteusz Czech <mail@tymek.cz>                                    *
 ****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
/**
 * @brief Check if year is leap year
 * @param [in] y Given year
 * @return 0 if false, 1 if true
 */
int leap_year(int y){   
   return ((y%4 == 0 && y%100 != 0) || y%400 == 0);
}
 
/**
 * @brief Calculate day of Fat Thursday
 * @param [in] y Given year
 * @return NULL on error, or string with (day).0(month) of holiday
 * @see http://g...content-available-to-author-only...o.gl/5rc7lo - day-of-march Easter calculus
 */
const char * fat_thursday(int y){
	char * date;
	int a, b, c, d, e, day, month;
 
	if(y <= 30) return NULL;
	a = y % 19;
	b = y >> 2;
	c = ((b / 25)|0) + 1;
	d = (c * 3) >> 2;
	e = ((a * 19) - (((c * 8 + 5) / 25)|0) + d + 15) % 30;
	e += ((29578 - a - (e << 5)) >> 10);
	e -= ((y % 7) + b - d + e + 2) % 7;
	day = e - 52;
	if(day < 1){
		day += 28;
		if(leap_year(y)) day++;
		if(day < 1){
			day += 31;
			month = 1;
		} else {
			month = 2;
		}
	} else {
		month = 3;
	}
	date = (char *)malloc( (size_t)sizeof(char *) * ((day>10)?5:6) );
	sprintf(date, "%d.%02d", day, month);
	return date;
}
 
int main(){
	int year;
	for(year = 2000; year <= 2300; year++){
		printf("%6s.%d\n", fat_thursday(year), year);
	}
	return 0;
}

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Success #stdin #stdout 0s 9424KB

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https://ideone.com/Vypp66

Obliczanie daty Tłustego Czwartku

language:

C (gcc 8.3)

created:

visibility:

public

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