Why operators perform comparisons and logic in PowerShell - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the number is equal to 10.

PowerShell

if ($number [1] 10) { Write-Output "Equal" }

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

A-gt

B-eq

C-lt

D-ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using -ne instead of -eq

Using -lt or -gt which check less or greater than

The -eq operator checks if two values are equal in PowerShell.

2fill in blank

medium

Complete the code to check if the value is less than 5.

PowerShell

if ($value [1] 5) { Write-Output "Less than 5" }

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

A-eq

B-ge

C-lt

D-ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using -ge which means greater or equal

Using -eq which means equal

The -lt operator means 'less than' in PowerShell.

3fill in blank

hard

Fix the error in the code to check if $a is not equal to $b.

PowerShell

if ($a [1] $b) { Write-Output "Not equal" }

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

A-eq

B-gt

C-lt

D-ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using -eq which means equal

Using -lt or -gt which check less or greater than

The -ne operator means 'not equal' in PowerShell.

4fill in blank

hard

Fill both blanks to check if $x is greater than 5 and less than 10.

PowerShell

if (($x [1] 5) -and ($x [2] 10)) { Write-Output "Between 5 and 10" }

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

A-gt

B-lt

C-eq

D-ne

Attempts:

3 left

💡 Hint

Common Mistakes

Using -eq or -ne instead of comparison operators

Mixing up greater and less than

-gt means greater than, and -lt means less than. Together they check if $x is between 5 and 10.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as uppercase words and values as their lengths if length is greater than 3.

PowerShell

$result = @{}; foreach ($word in $words) { if (([1] = $word.ToUpper()) -and ($word.Length [2] 3)) { $result[[3]] = $word.Length } }

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

A$key

B-gt

C$word

D$word.ToUpper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using $word instead of uppercase for key

Using -lt instead of -gt

Using $word instead of $key as dictionary key

We assign the uppercase word to $key (blank 1), check if length is greater than 3 (blank 2), and use $key as the dictionary key (blank 3).

Practice

1. In PowerShell, which operator is used to check if two values are equal?

easy

A. -gt

B. -ne

C. -eq

D. -lt

Solution

1. Step 1: Understand comparison operators

   PowerShell uses specific operators to compare values, such as -eq for equality, -ne for not equal, -gt for greater than, and -lt for less than.

2. Step 2: Identify the equality operator

   The operator -eq checks if two values are equal, returning True if they are the same.

3. Final Answer:

   -eq -> Option C

4. Quick Check:

   Equality operator = -eq [OK]

Hint: Remember: 'eq' means equal in PowerShell [OK]

Common Mistakes:

• Confusing -eq with -ne (not equal)
• Using == instead of -eq
• Mixing up -gt and -lt

2. Which of the following is the correct syntax to check if variable $a is greater than 10 in PowerShell?

easy

A. if ($a > 10) { }

B. if ($a -gt 10) { }

C. if ($a gt 10) { }

D. if ($a => 10) { }

Solution

1. Step 1: Recall PowerShell comparison syntax

   PowerShell uses operators with a dash, like -gt for greater than, not symbols like > or =>.

2. Step 2: Identify the correct operator for greater than

   The correct operator is -gt, so the syntax is if ($a -gt 10) { }.

3. Final Answer:

   if ($a -gt 10) { } -> Option B

4. Quick Check:

   Greater than operator = -gt [OK]

Hint: Use dash before comparison operators in PowerShell [OK]

Common Mistakes:

• Using > instead of -gt
• Writing 'gt' without dash
• Using invalid operator =>

3. What will be the output of this PowerShell code?

$x = 5
$y = 10
if ($x -lt 10 -and $y -gt 5) { 'True' } else { 'False' }

medium

A. False

B. No output

C. SyntaxError

D. True

Solution

1. Step 1: Evaluate each comparison

   $x -lt 10 means 5 less than 10, which is True. $y -gt 5 means 10 greater than 5, which is also True.

2. Step 2: Apply logical AND operator

   Both conditions are True, so True -and True equals True, so the if block runs and outputs 'True'.

3. Final Answer:

   True -> Option D

4. Quick Check:

   Both conditions True and combined with -and = True [OK]

Hint: Both sides must be true for -and to return True [OK]

Common Mistakes:

• Thinking -and returns True if one side is true
• Confusing -and with -or
• Ignoring operator precedence

4. Identify the error in this PowerShell snippet:

if ($a -eq 5 -or $b = 10) { 'Yes' } else { 'No' }

medium

A. Using = instead of -eq for comparison

B. Missing parentheses around conditions

C. Using -or instead of -and

D. No error, code is correct

Solution

1. Step 1: Check comparison operators

   PowerShell uses -eq for equality comparison, not = which is an assignment operator.

2. Step 2: Identify the error in $b = 10

   $b = 10 assigns 10 to $b, it does not compare. This causes a logic error in the if condition.

3. Final Answer:

   Using = instead of -eq for comparison -> Option A

4. Quick Check:

   Comparison needs -eq, not = [OK]

Hint: Use -eq for comparison, = is assignment [OK]

Common Mistakes:

• Using = instead of -eq in conditions
• Assuming -or needs parentheses
• Confusing logical operators

5. You want to check if a number $n is between 10 and 20 inclusive in PowerShell. Which expression correctly uses comparison and logical operators?

hard

A. if ($n -ge 10 -and $n -le 20) { 'In range' }

B. if ($n -gt 10 -or $n -lt 20) { 'In range' }

C. if ($n -ge 10 -or $n -le 20) { 'In range' }

D. if ($n -gt 10 -and $n -lt 20) { 'In range' }

Solution

1. Step 1: Understand inclusive range check

   To check if $n is between 10 and 20 inclusive, $n must be greater than or equal to 10 and less than or equal to 20.

2. Step 2: Match operators to conditions

   -ge means greater or equal, -le means less or equal, and both conditions must be true, so use -and.

3. Final Answer:

   if ($n -ge 10 -and $n -le 20) { 'In range' } -> Option A

4. Quick Check:

   Inclusive range uses -ge and -le with -and [OK]

Hint: Use -ge and -le with -and for inclusive range checks [OK]

Common Mistakes:

• Using -or instead of -and
• Using strict > and < instead of >= and <=
• Mixing up logical operators