String type and interpolation in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell string interpolation?

Consider the following PowerShell code snippet. What will it output?

PowerShell

$name = 'Alice'
$age = 30
"My name is $name and I am $age years old."

A My name is Alice and I am $age years old.

B My name is $name and I am $age years old.

C My name is $name and I am 30 years old.

D My name is Alice and I am 30 years old.

💡 Hint

Remember that double quotes allow variable interpolation in PowerShell.

In PowerShell, strings in double quotes expand variables inside them. So $name and $age are replaced by their values.

💻 Command Output

intermediate

What does this PowerShell code output?

What will be the output of this code snippet?

PowerShell

$value = 5
"The value doubled is ${value * 2}."

A The value doubled is ${value * 2}.

B The value doubled is 10.

C The value doubled is 5 * 2.

D The value doubled is value * 2.

💡 Hint

Use ${} to evaluate expressions inside strings in PowerShell.

Using ${} allows PowerShell to evaluate the expression inside and insert the result into the string.

📝 Syntax

advanced

Which option causes a syntax error in PowerShell string interpolation?

Identify which of the following lines will cause a syntax error when run in PowerShell.

A "Calculation: $[2 + 3]"

B "Value is ${2 + 3 * 4}"

C "Sum is $(2 + 3) * 4"

D "Result is $((2 + 3) * 4)"

💡 Hint

PowerShell uses $() or ${} for expressions inside strings, but $[] is invalid.

The $[] syntax is not valid for string interpolation in PowerShell, causing a syntax error.

🚀 Application

advanced

How to include a literal dollar sign in an interpolated string?

You want to output the string: Price is $5. Which PowerShell code will produce this exact output?

A "Price is $5"

B "Price is $$5"

C "Price is `$5"

D "Price is ${5}"

💡 Hint

Use the backtick ` to escape special characters in PowerShell strings.

In PowerShell, the backtick ` escapes the dollar sign to print it literally inside double quotes.

🧠 Conceptual

expert

What is the type of the variable after this assignment?

In PowerShell, what is the type of the variable $text after this code runs? $text = "Hello, $($env:USERNAME)!"

PowerShell

$text = "Hello, $($env:USERNAME)!"

A System.String

B System.Object[]

C System.Char[]

D System.Int32

💡 Hint

PowerShell variables holding text with interpolation are strings.

The variable $text holds a string with interpolated environment variable, so its type is System.String.