Why control flow directs execution in PowerShell - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

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

PowerShell

for ($i = 1; $i -le 3; $i[1]) { Write-Output $i }

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

A++

B+=

C--

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using += which requires a value like 1, causing a syntax error.

Using -= or -- which decrease the value and cause an infinite loop.

The ++ operator increases the value of $i by 1 each loop, allowing the loop to progress from 1 to 3.

2fill in blank

medium

Complete the code to check if a number is positive and print a message.

PowerShell

if ($number [1] 0) { Write-Output 'Positive number' }

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

A-ne

B-gt

C-eq

D-lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using -lt which checks for less than, not greater than.

Using -eq which checks for equality, not greater than.

The operator -gt means 'greater than'. It checks if $number is greater than 0.

3fill in blank

hard

Fix the error in the loop condition to stop at 5.

PowerShell

while ($count [1] 5) { Write-Output $count; $count += 1 }

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

A-gt

B-ge

C-le

D-lt

Attempts:

3 left

💡 Hint

Common Mistakes

Using -le which includes 5 and may cause an extra loop.

Using -gt or -ge which reverse the logic.

The loop should continue while $count is less than 5, so -lt is the correct operator.

4fill in blank

hard

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

PowerShell

for ($num = 2; $num [1] 10; $num [2] 2) { Write-Output $num }

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

A-le

B-lt

C+=

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using -lt which excludes 10 from the loop.

Using -= which decreases the number and causes an infinite loop.

The loop runs while $num is less than or equal to 10 (-le), and increases $num by 2 each time (+=).

5fill in blank

hard

Fill all three blanks to create a dictionary of words and their lengths for words longer than 3 letters.

PowerShell

$lengths = @{}; foreach ([3] in $words) { if ([3].Length -gt 3) { $lengths[[1]] = [2] } }

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

A$word

B$word.Length

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for key and loop variable.

Using the word itself as value instead of its length.

The dictionary uses word as the key, word.Length as the value, and loops over word in $words. The condition checks if the length is greater than 3.

Practice

1. What does control flow in a PowerShell script primarily do?

easy

A. It changes the script's color scheme.

B. It decides which parts of the script run and when.

C. It increases the script's speed automatically.

D. It saves the script to a file.

Solution

1. Step 1: Understand control flow purpose

   Control flow directs the order and conditions under which code runs.

2. Step 2: Match purpose to options

   Only It decides which parts of the script run and when. describes directing execution timing and choice.

3. Final Answer:

   It decides which parts of the script run and when. -> Option B

4. Quick Check:

   Control flow = directing execution [OK]

Hint: Control flow controls script steps, not appearance or speed [OK]

Common Mistakes:

• Confusing control flow with script styling
• Thinking control flow saves files
• Assuming control flow speeds up code automatically

2. Which of the following is the correct syntax to start an if statement in PowerShell?

easy

A. if (condition) {

B. if condition then {

C. if condition:

D. if condition {}

Solution

1. Step 1: Recall PowerShell if syntax

   PowerShell uses if (condition) { ... } with parentheses and braces.

2. Step 2: Compare options

   Only if (condition) { matches this syntax exactly.

3. Final Answer:

   if (condition) { -> Option A

4. Quick Check:

   PowerShell if uses parentheses and braces [OK]

Hint: PowerShell if always uses parentheses and braces [OK]

Common Mistakes:

• Omitting parentheses around condition
• Using 'then' keyword (not used in PowerShell)
• Using colon instead of braces

3. What will this PowerShell code output?

for ($i = 1; $i -le 3; $i++) { if ($i -eq 2) { continue } Write-Output $i }

medium

A. 1

B. 1 2 3

C. 2 3

D. 1 3

Solution

1. Step 1: Understand the loop and continue

   The loop runs $i from 1 to 3. When $i equals 2, 'continue' skips the rest of that iteration.

2. Step 2: Trace output values

   Output occurs only when $i is not 2, so outputs are 1 and 3.

3. Final Answer:

   1 3 -> Option D

4. Quick Check:

   continue skips 2, outputs 1 and 3 [OK]

Hint: continue skips current loop step, so that value is not output [OK]

Common Mistakes:

• Thinking continue outputs the skipped value
• Confusing continue with break
• Ignoring the if condition

4. Identify the error in this PowerShell snippet:

if $x -gt 10 { Write-Output 'Big' }

medium

A. Missing curly braces around the block.

B. Incorrect comparison operator.

C. Missing parentheses around the condition.

D. Write-Output cannot be used inside if.

Solution

1. Step 1: Check if statement syntax

   PowerShell requires parentheses around the condition in if statements.

2. Step 2: Verify given code

   The code lacks parentheses around '$x -gt 10', causing a syntax error.

3. Final Answer:

   Missing parentheses around the condition. -> Option C

4. Quick Check:

   if condition must be in parentheses [OK]

Hint: Always put conditions inside parentheses in if statements [OK]

Common Mistakes:

• Omitting parentheses around condition
• Thinking curly braces are missing (they are present)
• Believing Write-Output is invalid inside if

5. You want to run a script block repeatedly until a variable $count reaches 5, but skip printing when $count is 3. Which control flow structure correctly achieves this?

$count = 0
while ($count -lt 5) {
  $count++
  if ($count -eq 3) { continue }
  Write-Output $count
}

hard

A. The script uses while loop with continue to skip printing 3.

B. The script should use if-else instead of continue to skip 3.

C. The script must use a for loop, not while, to skip 3.

D. The script will print 3 because continue does not skip output.

Solution

1. Step 1: Analyze loop and continue usage

   The while loop increments $count until 5. When $count is 3, continue skips Write-Output.

2. Step 2: Confirm output behavior

   All numbers except 3 are printed, matching the requirement.

3. Final Answer:

   The script uses while loop with continue to skip printing 3. -> Option A

4. Quick Check:

   continue skips printing 3 in while loop [OK]

Hint: Use continue inside loops to skip specific iterations [OK]

Common Mistakes:

• Thinking continue prints skipped values
• Believing for loop is required here
• Replacing continue with if-else unnecessarily