While loop execution flow in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a while loop.

Java

int i = 1;
while (i [1] 5) {
    System.out.println(i);
    i++;
}

Drag options to blanks, or click blank then click option'

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'i < 5' which stops before printing 5.

Using 'i > 5' which never runs the loop.

The condition i <= 5 ensures the loop runs while i is 1 through 5.

2fill in blank

medium

Complete the code to stop the loop when the variable count reaches 10.

Java

int count = 0;
while (count [1] 10) {
    System.out.println(count);
    count++;
}

Drag options to blanks, or click blank then click option'

A>

B<=

C>=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' which causes the loop to never run.

Using '<=' which runs the loop one extra time.

The loop should run while count is less than 10, so count < 10 is correct.

3fill in blank

hard

Fix the error in the while loop condition to avoid an infinite loop.

Java

int x = 5;
while (x [1] 0) {
    System.out.println(x);
    x--;
}

Drag options to blanks, or click blank then click option'

A>=

B<

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' causes the loop to never run.

Using '>' alone excludes zero and may cause logic errors.

The condition x >= 0 ensures the loop runs while x is 5 down to 0, avoiding infinite loop.

4fill in blank

hard

Fill both blanks to create a while loop that prints even numbers from 2 to 10.

Java

int num = 2;
while (num [1] 10) {
    System.out.println(num);
    num [2] 2;
}

Drag options to blanks, or click blank then click option'

A<=

B+=

C-=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 10 from output.

Using '-=' decreases num causing infinite loop.

The condition num <= 10 includes 10, and num += 2 increases num by 2 each time.

5fill in blank

hard

Fill all three blanks to create a while loop that counts down from 15 to 5 by 2.

Java

int val = [1];
while (val [2] [3]) {
    System.out.println(val);
    val -= 2;
}

Drag options to blanks, or click blank then click option'

A15

B>=

C5

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' instead of '>=' causes the loop to never run.

Starting at 5 instead of 15 prints wrong numbers.

Start at 15, loop while val is greater than or equal to 5, counting down by 2.