#include <stdio.h>

int year = 0;
int isLeap = 0; // set to 1 if year is leap

void setIsLeap()
{
	isLeap = 0;
	if (year <= 1582) return;
	if (year % 4 != 0) return;
	if (year % 100 == 0 && year % 400 != 0) return;
	isLeap = 1;
}




int main(void)
{
	char response = 'y';
	while(1)
	{
		printf("enter a year -> ");
		scanf("%d", &year);
		setIsLeap();
		if (isLeap) {
			printf("%d is/was a leap year\n", year);
		} else {
			printf("%d is/was not a leap year\n", year);
		}

		printf("again?(y/n) ");
		getchar(); // flush \n
		response = getchar();
		if (response == 'n') break;
	}
	printf("bye\n");
}