While and do-while loops in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Kotlin

var i = 1
while (i [1] 5) {
    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' will stop before printing 5.

Using 'i > 5' will never enter the loop.

The while loop continues as long as i is less than or equal to 5, so it prints numbers 1 to 5.

2fill in blank

medium

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

Kotlin

var i = 1
do {
    println(i)
    i++
} while (i [1] 6)

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

A<

B>

C<=

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' will print 6 as well.

Using '>' will cause the loop to run only once or not at all.

The do-while loop runs at least once and continues while i is less than 6, printing 1 to 5.

3fill in blank

hard

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

Kotlin

var count = 0
while (count [1] 5) {
    println(count)
    // Missing increment
}

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

A<=

B>=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>=' or '>' will cause the loop to never run or run infinitely.

Not incrementing the counter causes infinite loop.

The condition should be count < 5 to run the loop 5 times. However, the loop will still be infinite because count is not incremented inside the loop.

4fill in blank

hard

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

Kotlin

var num = 2
while (num [1] 10) {
    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 '<' will exclude 10.

Using '-=' will decrease num and cause infinite loop.

The loop runs while num is less than or equal to 10, and increments num by 2 each time to print even numbers.

5fill in blank

hard

Fill all three blanks to create a do-while loop that prints numbers from 10 down to 1.

Kotlin

var i = [1]
do {
    println(i)
    i [2] 1
} while (i [3] 0)

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

A10

B-=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 will print only one number.

Using '+=' will increase i and cause infinite loop.

Using '<' in condition will cause infinite loop.

The loop starts at 10, decreases i by 1 each time, and continues while i is greater than 0, printing 10 down to 1.