Official Question & PDF

Download Full FRQ PDF →

Provided Code

public class APCalendar
{
    private static boolean isLeapYear(int year) { /* not shown */ }
        public static int numberOfLeapYears(int year1, int year2) {
        /* part (a) */
    }
    private static int firstDayOfYear(int year) { /* not shown */ }
    private static int dayOfYear(int month, int day, int year) { /* not shown */ }
        public static int dayOfWeek(int month, int day, int year) {
        /* part (b) */
    }
}

Part A — 4 Points

Write numberOfLeapYears: return the count of leap years between year1 and year2 inclusive, using isLeapYear.

Write Your Solution

Check Answer Clear

public static int numberOfLeapYears(int year1, int year2)
{
    int count = 0;
    for (int year = year1; year <= year2; year++)
    {
        if (isLeapYear(year))
        {
            count++;
        }
    }
    return count;
}

Part B — 5 Points

Write dayOfWeek: return the day of week (0=Sunday, 6=Saturday) for the given date, using firstDayOfYear and dayOfYear.

Write Your Solution

Check Answer Clear

public static int dayOfWeek(int month, int day, int year)
{
    int firstDay = firstDayOfYear(year);
    int dayNum = dayOfYear(month, day, year);
    return (firstDay + dayNum - 1) % 7;
}

Common Mistakes to Avoid

Exam Tips

Frequently Asked Questions