String concatenation in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to join two strings with a space.

PowerShell

$greeting = "Hello " [1] "World"

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

A/

B+

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using - or * instead of + causes errors or wrong results.

In PowerShell, the plus sign (+) is used to concatenate strings.

2fill in blank

medium

Complete the code to add an exclamation mark at the end of the string.

PowerShell

$message = "Hi" [1] "!"

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using - or * instead of + causes errors.

Use + to join strings in PowerShell, so the exclamation mark is added.

3fill in blank

hard

Fix the error in the code to concatenate strings correctly.

PowerShell

$name = "John" [1] "Doe"

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

A*

B&

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using & causes errors because it is for running commands.

The + operator correctly concatenates strings in PowerShell. The & operator runs commands, so it is incorrect here.

4fill in blank

hard

Fill both blanks to create a full sentence by joining strings and a variable.

PowerShell

$age = 30
$sentence = "I am " [1] $age [2] " years old."

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

A+

B-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using - or * causes errors or wrong output.

Use + to join strings and variables in PowerShell. Both blanks need + to concatenate properly.

5fill in blank

hard

Fill all three blanks to build a greeting with a name and punctuation.

PowerShell

$first = "Jane"
$last = "Smith"
$greet = "Hello, " [1] $first [2] $last [3] "!"

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

A+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using - causes errors or breaks the string.

Use + to join all parts of the greeting string in PowerShell.

Practice

1. Which operator is used in PowerShell to join two strings together?

easy

A. /

B. -

C. +

D. *

Solution

1. Step 1: Understand string joining in PowerShell

   PowerShell uses the plus sign (+) to concatenate or join strings.

2. Step 2: Identify the correct operator

   Among the options, only + is used for string concatenation.

3. Final Answer:

   + -> Option C

4. Quick Check:

   String concatenation operator = + [OK]

Hint: Use + to join strings simply in PowerShell [OK]

Common Mistakes:

• Using - instead of +
• Trying to use * for strings
• Using / which is division

2. Which of the following is the correct syntax to concatenate variables $a and $b with a space between them in PowerShell?

easy

A. $a + ' ' + $b

B. $a - ' ' - $b

C. $a * ' ' * $b

D. $a / ' ' / $b

Solution

1. Step 1: Check operator for concatenation

   PowerShell uses + to join strings, so + is correct here.

2. Step 2: Confirm space inclusion

   Adding ' ' between variables adds a space between the joined strings.

3. Final Answer:

   $a + ' ' + $b -> Option A

4. Quick Check:

   Concatenate with + and add space as ' ' [OK]

Hint: Add spaces manually with ' ' when joining strings [OK]

Common Mistakes:

• Using - instead of +
• Forgetting to add space
• Using * or / operators

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

$name = "John"
$greeting = "Hello, " + $name + "!"
Write-Output $greeting

medium

A. Hello, John!

B. Hello, $name!

C. Hello, !

D. JohnHello, !

Solution

1. Step 1: Understand variable values

   $name contains "John" and is concatenated with strings using +.

2. Step 2: Evaluate concatenation

   "Hello, " + $name + "!" becomes "Hello, John!" as $name is replaced by its value.

3. Final Answer:

   Hello, John! -> Option A

4. Quick Check:

   Concatenate strings and variable value = Hello, John! [OK]

Hint: Variables inside double quotes concatenate with + correctly [OK]

Common Mistakes:

• Expecting $name to print literally
• Missing + operator
• Confusing output order

4. Identify the error in this PowerShell code snippet:

$first = "Good"
$second = "Morning"
$message = $first + $second
Write-Output $message

medium

A. Incorrect use of + operator

B. Missing space between words in concatenation

C. Variables not declared properly

D. Write-Output is invalid command

Solution

1. Step 1: Check concatenation result

   $first + $second joins "Good" and "Morning" without space, resulting in "GoodMorning".

2. Step 2: Identify missing space

   To separate words, a space string ' ' should be added between variables.

3. Final Answer:

   Missing space between words in concatenation -> Option B

4. Quick Check:

   Concatenation lacks space, so words join directly [OK]

Hint: Add ' ' between strings to include spaces [OK]

Common Mistakes:

• Assuming + adds space automatically
• Thinking variables are undeclared
• Believing Write-Output is wrong

5. You want to create a full name string from variables $firstName and $lastName with a space in between. Which of these PowerShell commands correctly does this and outputs the full name?

hard

A. Write-Output $firstName * ' ' * $lastName

B. Write-Output $firstName + $lastName

C. Write-Output $firstName - $lastName

D. Write-Output "$firstName $lastName"

Solution

1. Step 1: Understand string interpolation in double quotes

   Using double quotes with variables inside inserts their values with spaces as typed.

2. Step 2: Compare options

   Write-Output "$firstName $lastName" uses double quotes with space between variables, producing correct full name with space.

3. Final Answer:

   Write-Output "$firstName $lastName" -> Option D

4. Quick Check:

   Double quotes allow variable insertion with spaces easily [OK]

Hint: Use double quotes to insert variables with spaces easily [OK]

Common Mistakes:

• Forgetting space in concatenation
• Using - or * operators incorrectly
• Not using double quotes for interpolation