Java Loops Coding Questions and Answers

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Welcome to the Java Loops Coding Quiz. In this quiz, we present 10 coding MCQ questions to test your coding knowledge on the Java Loops (for loop, while loop, do-while-loop) topic. Each question has a correct and brief explanation.

1. What is the output of the following Java code snippet?

for (int i = 0; i < 5; i++) {
    if (i == 2) {
        break;
    }
    System.out.print(i + " ");
}

a) 0 1

b) 0 1 2

c) 0 1 2 3 4

d) 0 1 3 4

Answer:

a) 0 1

Explanation:

The break statement exits the loop when i equals 2. Thus, only 0 and 1 are printed.

2. What does this Java code snippet output?

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

a) 0 1 2

b) 0 1 2 3

c) 1 2 3

d) An infinite loop

Answer:

a) 0 1 2

Explanation:

The loop prints i and increments it each time until i is less than 3.

3. Identify the output of the following code:

int count = 0;
do {
    count++;
} while (count < 3);
System.out.println(count);

a) 2

b) 3

c) 4

d) An infinite loop

Answer:

b) 3

Explanation:

The do-while loop increments count until it is less than 3. It stops when count becomes 3.

4. What will be printed by this Java code?

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

a) 0 2 4

b) 1 3

c) 1 3 4

d) 0 1 2 3 4

Answer:

b) 1 3

Explanation:

The continue statement skips the current iteration of the loop when i is even. Thus, only the odd numbers 1 and 3 are printed.

5. What does this code snippet output?

int i = 1;
while (i <= 5) {
    System.out.print(i + " ");
    i++;
}

a) 1 2 3 4 5

b) 1 2 3 4

c) 2 3 4 5

d) An infinite loop

Answer:

a) 1 2 3 4 5

Explanation:

The while loop iterates as long as i is less than or equal to 5, printing numbers from 1 to 5.

6. What is the result of executing this code?

int sum = 0;
for (int i = 0; i <= 4; i++) {
    sum += i;
}
System.out.println(sum);

a) 6

b) 10

c) 14

d) 20

Answer:

b) 10

Explanation:

The for loop calculates the sum of numbers from 0 to 4, resulting in 10.

7. What will the following Java code snippet output?

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        if (i == j) {
            break;
        }
        System.out.print(i + "" + j + " ");
    }
}

a) 01 02 10 12 20 21

b) 00 11 22

c) 01 10 12 20 21

d) 01 10 20

Answer:

c) 01 10 12 20 21

Explanation:

The break statement exits the inner loop when i equals j. It results in pairs where i is not equal to j.

8. What does the following code snippet print?

int i = 5;
while (i > 0) {
    i--;
    if (i == 2) {
        continue;
    }
    System.out.print(i + " ");
}

a) 4 3 1 0

b) 4 2 1 0

c) 4 3 2 1

d) 4 3 1

Answer:

d) 4 3 1

Explanation:

The continue statement skips the print statement when i is 2. The loop prints 4, 3, 1, and then 0.

9. Determine the output of this Java code:

int x = 0;
for (int i = 10; i > 0; i--) {
    x += i;
}
System.out.println(x);

a) 45

b) 55

c) 60

d) 100

Answer:

b) 55

Explanation:

The for loop adds the numbers from 10 to 1, resulting in a total of 55.

10. What is the result of the following code snippet?

int i = 0;
do {
    i++;
    if (i == 4) {
        break;
    }
} while (i < 7);
System.out.println(i);

a) 3

b) 4

c) 7

d) An infinite loop

Answer:

b) 4

Explanation:

The do-while loop increments i until it reaches 4, where the break statement exits the loop.

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