While loop in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 3 using a while loop.

Ruby

i = 1
while [1]
  puts i
  i += 1
end

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

Ai == 4

Bi < 4

Ci > 4

Di != 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a condition that never becomes false, causing an infinite loop.

Using the wrong comparison operator.

The while loop continues as long as the condition is true. Here, it runs while i is less than 4, printing 1, 2, and 3.

2fill in blank

medium

Complete the code to stop the loop when the variable reaches 5.

Ruby

count = 0
while count [1] 5
  puts count
  count += 1
end

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

A!=

B>

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using greater than operator which causes the loop to never run.

Using equality operator which runs only when count equals 5.

The loop should run while count is less than 5, so it stops when count reaches 5.

3fill in blank

hard

Fix the error in the loop condition to print numbers from 1 to 4.

Ruby

num = 1
while num [1] 5
  puts num
  num += 1
end

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using >= or > causes the loop to not run or run infinitely.

Using <= prints an extra number 5.

The loop should run while num is less than 5 to print numbers 1 to 4.

4fill in blank

hard

Fill both blanks to create a while loop that prints even numbers from 2 to 8.

Ruby

i = 2
while i [1] 8
  puts i
  i [2] 2
end

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

A<=

B+=

C<

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of <= misses printing 8.

Using -= decreases i causing an infinite loop.

The loop runs while i is less than or equal to 8, and i increases by 2 each time to print even numbers.

5fill in blank

hard

Fill all three blanks to create a while loop that prints numbers from 10 down to 6.

Ruby

n = 10
while n [1] 5
  puts [2]
  n [3] 1
end

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

A>

Bn

C-=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

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

Printing a wrong variable or not decreasing n causes infinite loop.

The loop runs while n is greater than 5, prints n, and decreases n by 1 each time.