Loop initialization, condition, update in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the loop variable correctly.

Java

for ([1]; i < 5; i++) {
    System.out.println(i);
}

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Aint = 0

Bi = 0

Cint i

Dint i = 0

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to declare the variable type.

Using assignment without declaration.

The loop variable must be declared and initialized as int i = 0 inside the for loop.

2fill in blank

medium

Complete the code to write the correct loop condition.

Java

for (int i = 0; [1]; i++) {
    System.out.println(i);
}

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Ai < 5

Bi == 5

Ci > 5

Di <= 5

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= 5 runs the loop one extra time.

Using == 5 does not run the loop at all.

The loop should run while i is less than 5, so the condition is i < 5.

3fill in blank

hard

Fix the error in the loop update expression.

Java

for (int i = 0; i < 5; [1]) {
    System.out.println(i);
}

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Ai++

Bi = i + 1

Ci--

Di += 2

Attempts:

3 left

💡 Hint

Common Mistakes

Using decrement i-- causes an infinite loop.

Using i += 2 skips numbers.

The update expression i++ increases i by 1 each loop, which is the standard increment.

4fill in blank

hard

Fill both blanks to create a loop that counts down from 10 to 1.

Java

for (int i = [1]; i [2] 0; i--) {
    System.out.println(i);
}

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A10

B>

C>=

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 0 instead of 10.

Using i < 0 as condition causes no iterations.

The loop starts at 10 and runs while i > 0, printing numbers from 10 down to 1.

5fill in blank

hard

Fill all three blanks to create a loop that prints even numbers from 2 to 10.

Java

for (int [1] = [2]; [1] [3] 10; [1] += 2) {
    System.out.println([1]);
}

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Ai

B2

C<=

Dj

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names.

Starting at 0 or 1 instead of 2.

Using < instead of <= causes missing 10.

The loop variable is i, starting at 2, running while i <= 10, and increasing by 2 each time to print even numbers.