Variable creation with $ in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a variable named name with the value "Alice".

PowerShell

[1]name = "Alice"

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

A$

B@

C#

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the $ before the variable name.

Using other symbols like @ or # instead of $.

In PowerShell, variables start with the dollar sign ($). So, to create a variable named 'name', you write '$name'.

2fill in blank

medium

Complete the code to assign the number 10 to a variable named count.

PowerShell

[1]count = 10

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

A#

B&

C$

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Using symbols other than $ to start the variable.

Omitting the $ symbol.

Variables in PowerShell always start with the dollar sign ($). So, '$count = 10' assigns 10 to the variable count.

3fill in blank

hard

Fix the error in the code to correctly create a variable named message with the value "Hello".

PowerShell

[1]message = "Hello"

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

A$

B@

C#

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving out the $ before the variable name.

Using other symbols instead of $.

In PowerShell, the variable name must start with a dollar sign ($). So, '$message = "Hello"' is correct.

4fill in blank

hard

Fill both blanks to create a variable named age and assign it the value 25.

PowerShell

[1]age [2] 25

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

A$

B=

C:

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':' or '==' instead of '=' for assignment.

Forgetting the $ before the variable name.

Variables start with $ and assignment uses = in PowerShell. So, '$age = 25' is correct.

5fill in blank

hard

Fill all three blanks to create a variable named greeting and assign it the value "Hi".

PowerShell

[1]greeting [2] [3]

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

A$

B=

C"Hi"

D'Hi'

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes instead of double quotes (though both work, double quotes are common).

Omitting $ or =.

Variables start with $, assignment uses =, and strings can be in double quotes. So, '$greeting = "Hi"' is correct.

Practice

1. What does the $ symbol do in PowerShell when placed before a word like $name?

easy

A. It prints the word 'name' to the screen.

B. It creates a variable named 'name' to store data.

C. It comments out the line.

D. It runs a command called 'name'.

Solution

1. Step 1: Understand the role of $ in PowerShell

   The $ symbol is used to declare or access variables in PowerShell.

2. Step 2: Identify what $name means

   $name means a variable named 'name' that can hold data like text or numbers.

3. Final Answer:

   It creates a variable named 'name' to store data. -> Option B

4. Quick Check:

   $ before word = variable creation [OK]

Hint: Remember: $ always starts a variable name [OK]

Common Mistakes:

• Thinking $ runs commands
• Confusing $ with comments
• Assuming $ prints text directly

2. Which of the following is the correct way to create a variable named age with the value 30 in PowerShell?

easy

A. $age = 30

B. set age = 30

C. age = 30

D. var $age = 30

Solution

1. Step 1: Recall PowerShell variable syntax

   Variables start with $ and assignment uses =.

2. Step 2: Check each option

   $age = 30 uses $age = 30, which is correct syntax for variable creation and assignment.

3. Final Answer:

   $age = 30 -> Option A

4. Quick Check:

   Variable = $name = value [OK]

Hint: Always start variable names with $ in PowerShell [OK]

Common Mistakes:

• Omitting the $ before variable name
• Using 'set' keyword which is not PowerShell syntax
• Adding 'var' keyword which is not used in PowerShell

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

$greeting = "Hello"
$name = "Sam"
Write-Output "$greeting, $name!"

medium

A. Error: Variable not defined

B. $greeting, $name!

C. Hello $name!

D. Hello, Sam!

Solution

1. Step 1: Understand variable assignment

   $greeting is assigned "Hello" and $name is assigned "Sam".

2. Step 2: Understand string interpolation in double quotes

   Inside double quotes, variables like $greeting and $name are replaced by their values.

3. Final Answer:

   Hello, Sam! -> Option D

4. Quick Check:

   Variables inside "" show their values [OK]

Hint: Use double quotes to insert variables inside strings [OK]

Common Mistakes:

• Using single quotes which do not expand variables
• Expecting variable names to print literally
• Forgetting to assign variables before use

4. Identify the error in this PowerShell script:

$number = 10
$number = $number + 5
Write-Output number

medium

A. Cannot add numbers in PowerShell

B. Variable $number not declared

C. Missing $ before 'number' in Write-Output

D. Write-Output cannot print variables

Solution

1. Step 1: Check variable usage in Write-Output

   The script tries to print 'number' without $, so it prints the word literally.

2. Step 2: Correct usage of variable in output

   To print the variable value, it should be Write-Output $number.

3. Final Answer:

   Missing $ before 'number' in Write-Output -> Option C

4. Quick Check:

   Variables need $ to be recognized [OK]

Hint: Always use $ before variable names when printing [OK]

Common Mistakes:

• Forgetting $ before variable in output
• Thinking variables need declaration keyword
• Assuming Write-Output can't print variables

5. You want to create a variable $fullName by combining two variables $firstName and $lastName with a space in between. Which code correctly does this in PowerShell?

hard

A. $fullName = $firstName + " " + $lastName

B. $fullName = '$firstName $lastName'

C. $fullName = $firstName $lastName

D. $fullName = "$firstName$lastName"

Solution

1. Step 1: Understand string concatenation in PowerShell

   Use + to join strings and include a space as " ".

2. Step 2: Analyze each option

   $fullName = $firstName + " " + $lastName correctly adds $firstName, a space, and $lastName to form full name.

3. Final Answer:

   $fullName = $firstName + " " + $lastName -> Option A

4. Quick Check:

   Use + and " " to join variables with space [OK]

Hint: Use + and " " to join variables with space [OK]

Common Mistakes:

• Using single quotes which do not expand variables
• Missing operator between variables
• Concatenating without space when needed