/* YOUR FILE-HEADER COMMENT HERE */

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

/**
 * Calculates how many days are in the given month, also based upon if
 * this a leap year or not.
 *
 * If the month number is invalid, return 0.
 *
 * @param[in] month_num Month number, where 1 is January, 12 is December
 * @param[in] is_leap_year Non-zero if this is a leap year, only
 * relevant for February (month number is 2)
 * @return Days in month
 */
extern unsigned month_calc(unsigned month_num, unsigned is_leap_year);

int main(int argc, char *argv[])
{
	/* PART 3: YOUR CODE HERE */

	if (argc < 3) {
		fprintf(stderr, "Need a month number and year.\n");
		exit(EXIT_FAILURE);
	} else {
		int month_num = atoi(argv[1]);
		int year = atoi(argv[2]);
		int is_leap_year = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
		/* UNCOMMENT THE FOLLOWING LINE WHEN STARTING PART 4
		printf("Number of days for month %d, year %d is: %u\n", month_num, year, month_calc(month_num, is_leap_year));
		*/
	}
	return 0;
}