Type casting in PowerShell - Step-by-Step Execution

Concept Flow - Type casting

Start with a value

↓

Choose target type

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Apply cast operator ([type

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Value converted to new type

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Use converted value in script

Type casting changes a value from one type to another using the cast operator in PowerShell.

Execution Sample

PowerShell

[int]$num = "123"
Write-Output $num
[int]$num2 = 45.67
Write-Output $num2
[string]$text = 100
Write-Output $text

This script converts strings and numbers to different types and prints the results.

Execution Table

Step	Expression	Action	Result	Output
1	[int]"123"	Cast string "123" to int	123 (int)	123
2	Write-Output $num	Print variable $num	123	123
3	[int]45.67	Cast float 45.67 to int (drops decimal)	45 (int)	45
4	Write-Output $num2	Print variable $num2	45	45
5	[string]100	Cast int 100 to string	"100" (string)	100
6	Write-Output $text	Print variable $text	100	100
7	End	No more commands	Script ends

💡 All casts applied and outputs printed, script ends.

Variable Tracker

Variable	Start	After Step 1	After Step 3	After Step 5	Final
$num	null	123 (int)	123 (int)	123 (int)	123 (int)
$num2	null	null	45 (int)	45 (int)	45 (int)
$text	null	null	null	"100" (string)	"100" (string)

Key Moments - 3 Insights

Why does casting 45.67 to [int] result in 45 and not 46?

Casting to [int] in PowerShell truncates the decimal part instead of rounding. See execution_table step 3 where 45.67 becomes 45.

Can you cast a string that contains letters to [int]?

No, casting a non-numeric string to [int] causes an error. Only numeric strings like "123" can be cast safely, as shown in step 1.

What happens when you cast an integer to [string]?

The integer is converted to its text form. In step 5, 100 becomes "100" as a string.

Visual Quiz - 3 Questions

Look at the execution_table at step 3. What is the value of $num2 after casting?

A 45.67

B 46

C 45

D "45.67"

💡 Hint

Check the 'Result' column at step 3 in the execution_table.

At which step does the variable $text get assigned a value?

A Step 5

B Step 1

C Step 3

D Step 2

💡 Hint

Look at the 'Variable' column in variable_tracker and see when $text changes from null.

If you try to cast the string "abc" to [int], what will happen?

A It will convert to 0

B It will cause an error

C It will convert to "abc"

D It will convert to 1

💡 Hint

Refer to key_moments about casting non-numeric strings to int.

Concept Snapshot

[type]value casts value to the specified type.
Casting truncates decimals when converting to int.
Casting non-numeric strings to int causes errors.
Casting int to string converts number to text.
Use casting to ensure variables have correct types.

Full Transcript

This PowerShell script shows how to change a value's type using casting. We start with a string "123" and cast it to an integer, which becomes 123. Then we cast a decimal number 45.67 to an integer, which drops the decimal part and becomes 45. Next, we cast an integer 100 to a string, which becomes "100". Each step prints the result. Casting helps convert values to the type you need. Note that casting a decimal to int truncates, not rounds. Also, casting a non-numeric string to int will cause an error. This example helps beginners see how type casting works step-by-step.