While loop in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a while loop that runs as long as count is less than 5.

Swift

var count = 0
while count [1] 5 {
    print(count)
    count += 1
}

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

A<

B>

C==

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of < will cause the loop to never run.

Using == will only run if count starts exactly at 5.

The while loop continues as long as the condition is true. Using < means it runs while count is less than 5.

2fill in blank

medium

Complete the code to stop the loop when number reaches 10.

Swift

var number = 0
while number [1] 10 {
    print(number)
    number += 2
}

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

A<=

B<

C>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= will include 10, which might cause unexpected behavior.

Using > or == will not run the loop as expected.

The loop should run while number is less than 10, so it stops before reaching 10.

3fill in blank

hard

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

Swift

var x = 5
while x [1] 0 {
    print(x)
    x -= 1
}

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.

Using >= will cause the loop to run one extra time including zero.

The loop should run while x is greater than 0, counting down to stop at 0.

4fill in blank

hard

Fill both blanks to create a while loop that prints numbers from 1 to 5.

Swift

var num = 1
while num [1] 5 {
    print(num)
    num [2] num + 1
}

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

A<=

B<

C+=

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < will miss printing 5.

Using += results in num += num + 1, which is incorrect.

The loop runs while num is less than or equal to 5. The variable num is updated by assigning num + 1 to it.

5fill in blank

hard

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

Swift

var val = [1]
while val [2] 10 {
    print(val)
    val [3] val + 2
}

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

A2

B<=

C=

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Starting val at 0 will print zero, which is not an even number in this context.

Using < will miss printing 10.

Using += results in val += val + 2, which is incorrect.

Start val at 2. Loop while val is less than or equal to 10. Update val by assigning val + 2.