Type casting in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is type casting in PowerShell?

Type casting in PowerShell means converting a value from one data type to another, like turning a string into a number.

beginner

How do you cast a string to an integer in PowerShell?

Use [int] before the value, like: [int]"123" converts the string "123" to the number 123.

intermediate

What happens if you cast a non-numeric string to an integer in PowerShell?

PowerShell throws an error because it cannot convert text like "hello" to a number.

beginner

How can you cast a number to a string in PowerShell?

Use [string] before the number, like: [string]123 becomes the string "123".

beginner

Why is type casting useful in scripting?

It helps scripts work correctly by making sure data is in the right form, like numbers for math or strings for text.

Which syntax correctly casts a string to an integer in PowerShell?

A convert-to-int "456"

B int("456")

C cast int "456"

D [int]"456"

In PowerShell, you cast by placing the type in square brackets before the value, like [int]"456".

What will happen if you run: [int]"abc" in PowerShell?

A It throws an error

B It converts to 0

C It converts to 1

D It returns the string "abc"

PowerShell cannot convert non-numeric strings to integers and will throw an error.

How do you convert the number 100 to a string in PowerShell?

A toString(100)

B convert-string 100

C [string]100

D string(100)

Use [string] before the number to cast it to a string in PowerShell.

Why might you need to cast types in a script?

A To ensure data is the correct type for operations

B To change variable names

C To make the script run faster

D To delete variables

Casting ensures data is in the right form, like numbers for math or strings for text, so operations work correctly.

Which of these is NOT a valid PowerShell type cast?

A [int]"123"

B [char]"1234"

C [float]"12.34"

D [bool]"True"

PowerShell does not support [char] casting with multi-character strings; chars are single characters.

Explain how to convert a string to an integer in PowerShell and what happens if the string is not a number.

Think about placing the type in square brackets before the value.

Describe why type casting is important when writing scripts in PowerShell.

Consider what happens if you try to do math on text.