U I T W E R K I N G E N (java)

Determine Output 1 (5 points)
3 3
6 6
3 6
3 3
6 3
3 12
6 6


Determine Output 2 (5 points)
4 5
9 1
9 5
13 3
4 6
13 13


Assignment 2a (4 points)
public static double sumTerms (int x, int n) {
    double result = 0.0;
    int sign = 1,
        denominator = 3,
	power = x*x;

    for (int i = 0; i < n; i++) {
        double term = sign * (1.0 / denominator) * power;
        result += term; 

        sign = -sign;
        denominator += 1;
        power *= x;
    }

    return result;
}


Assignment 2b (5 points)
public static boolean numberOfTops (int[][] m) {
    int result = 0;

    for (int i = 0; i < m.length; i++) {
        for (int j = 1; j < m[0].length-1; j++) {
            if (m[i][j] > m[i][j-1] && m[i][j] > m[i][j+1]) {
                result += 1;
            }
        }
    }

    return result;
}


Assignment 3a (4 points)
// in the class Street
boolean expensive () {
    double sumHousePrices = 0.0;
    for (int i = 0; i < numberOfHouses; i++) {
        sumHousePrices += houseArray[i].price;
    }
    double averageHousePrice = sumHousesPrices / numberOfHouses;
    return averageHousePrice >= 350000.0;
}


Assignment 3b (6 points)
// in the class Street
boolean isLane() { // 3 points
    int n = name.length();
    if (n < 5) {
        return false;
    }

    return name.substring(n-4).equals("lane");
}

// in the class Village
int numberOfLanes () {
    int result = 0;

    for (int i = 0; i < numberOfStreets; i++) {
        if (streetArray[i].isLane()) {
            result += 1;
        }
    }

    return result
}


Assignment 3c (8 points)
// in the class House
boolean isBig () { // 2 points
    return numberOfFloors > 1 && hasGarden;
}

// in the class Street
boolean majorityBig () { // 3 points
    int numberOfBigHouses = 0;
    for (int i = 0; i < numberOfHouses; i++) {
        if (houseArray[i].isBig()) {
            numberOfBigHouses += 1;
        }
    }
    double percentage = 100.0 * numberOfBigHouses / numberOfHouses
    return percentage > 50.0;
}

// in the class Village
Village bigHouses () { // 3 points
    Village result = new Village("big"); // any name is OK

    for (int i = 0; i < numberOfStreets; i++) {
        Street street = streetArray[i];
        if (street.majorityBig()) {
            result.add(street);
        }
    }

    return result;
}


Assignment 4a (4 points)
public static void print (int n) {
    if (n == 1) {
        System.out.print("(a)");
        return;
    }

    print('(', 1);
    print('a', n);
    print(n-1);
    print('a', n);
    print(')', 1);
}


Assignment 4b (4 points)
public static String dashes (String s) {
    if (str.length() < 2) {
        return str;
    }
  
    char firstCharacter = str.charAt(0);
    String rest = str.substring(1);
    return firstCharacter + "-" + dashes(rest);
}