ap computer science a 2018 free-response questions marking scheme code example

Example 1: 2019 ap computer science free response answers

// Part A
public static int numberOfLeapYears(int year1, int year2) {
	int cnt = 0;
	for (int y=year1; y<=year2; y++) {
		if (isLeapYear(y))
			cnt++;
	}
	return cnt; 
}

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

Example 2: 2019 ap computer science free response answers

public class StepTracker {
	private int days;
	private int activeDays;
	private int totalSteps;
	private int minActive;
	
	public StepTracker(int m) {
		minActive = m;
		days = 0;
		activeDays = 0;
		totalSteps = 0; 
	}
	
	public void addDailySteps(int steps) {
		days++;
		totalSteps += steps;
		if (steps >= minActive) {
			activeDays++;
		}
	}
	
	public int activeDays() {
		return activeDays; 
	}
	
	public double averageSteps() {
		if (days == 0) {
			return 0.0; 
		}
		return (double)totalSteps / days; 
	}
}