Module 4: Control Flow - Final Quiz MCQs

What is printed by the following Java 14+ switch expression?

int code = 2;
String message = switch (code) {
    case 1 -> "Low";
    case 2, 3 -> "Medium";
    case 4 -> "High";
    default -> "Unknown";
};
System.out.println(message);

What is the output of the following do-while loop?

int count = 10;
do {
    count += 5;
} while (count < 10);
System.out.println(count);

What will be printed by the following labeled break snippet?

outer:
for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        if (i == 2 && j == 2) {
            break outer;
        }
        System.out.print(i + "" + j + " ");
    }
}

What will be printed by this enhanced for-each loop?

int[] nums = {2, 4, 6};
int sum = 0;
for (int n : nums) {
    sum += n;
}
System.out.println(sum);

What is the output of the following continue statement?

int total = 0;
for (int i = 1; i <= 5; i++) {
    if (i % 2 == 0) continue;
    total += i;
}
System.out.println(total);

What will be printed by the following switch fall-through snippet without break statements?

int score = 2;
int points = 0;
switch (score) {
    case 1: points += 10;
    case 2: points += 20;
    case 3: points += 30;
    default: points += 5;
}
System.out.println(points);

What is the exact output of this while loop containing a postfix increment in its condition?

int i = 0;
while (i++ < 3) {
    System.out.print(i + " ");
}

What is the output of the following multi-variable for loop?

int count = 0;
for (int i = 0, j = 10; i < j; i += 2, j -= 2) {
    count += (i + j);
}
System.out.println(count);

What will be printed by the following labeled continue snippet?

int sum = 0;
outer:
for (int i = 1; i <= 3; i++) {
    for (int j = 1; j <= 3; j++) {
        if (j == 2) continue outer;
        sum += (i * 10 + j);
    }
}
System.out.println(sum);

What will be printed after attempting to modify array elements inside an enhanced for-each loop?

int[] arr = {1, 2, 3};
for (int x : arr) {
    x = x * 10;
}
System.out.println(arr[0] + " " + arr[1] + " " + arr[2]);

What is the exact output of this do-while loop with postfix increment in the condition?

int k = 1;
do {
    System.out.print(k + " ");
} while (k++ < 3);
System.out.print("final=" + k);