Arithmetic operators in PowerShell - Step-by-Step Execution

Concept Flow - Arithmetic operators

Start

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Input numbers

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Choose operator: +, -, *, /, %

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Perform calculation

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Show result

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End

This flow shows how arithmetic operators take numbers, perform the chosen operation, and produce a result.

Execution Sample

PowerShell

$a = 10
$b = 3
$sum = $a + $b
$diff = $a - $b
$prod = $a * $b
$quot = $a / $b
$mod = $a % $b
Write-Output "$sum, $diff, $prod, $quot, $mod"

This script calculates sum, difference, product, quotient, and remainder of two numbers and prints them.

Execution Table

Step	Variable	Operation	Calculation	Result
1	$a	Assign	10	10
2	$b	Assign	3	3
3	$sum	Addition	10 + 3	13
4	$diff	Subtraction	10 - 3	7
5	$prod	Multiplication	10 * 3	30
6	$quot	Division	10 / 3	3.33333333333333
7	$mod	Modulo	10 % 3	1
8	Output	Write-Output	"13, 7, 30, 3.33333333333333, 1"	13, 7, 30, 3.33333333333333, 1

💡 All arithmetic operations completed and results output.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5	After Step 6	After Step 7	Final
$a	undefined	10	10	10	10	10	10	10	10
$b	undefined	undefined	3	3	3	3	3	3	3
$sum	undefined	undefined	undefined	13	13	13	13	13	13
$diff	undefined	undefined	undefined	undefined	7	7	7	7	7
$prod	undefined	undefined	undefined	undefined	undefined	30	30	30	30
$quot	undefined	undefined	undefined	undefined	undefined	undefined	3.33333333333333	3.33333333333333	3.33333333333333
$mod	undefined	undefined	undefined	undefined	undefined	undefined	undefined	1	1

Key Moments - 3 Insights

Why does division result in a decimal number instead of an integer?

In step 6 of the execution_table, division of 10 by 3 results in 3.3333 because PowerShell performs floating-point division by default.

What does the modulo operator (%) do?

As shown in step 7, modulo returns the remainder after division. Here, 10 % 3 equals 1 because 3 fits into 10 three times with remainder 1.

Are the original variables $a and $b changed by the operations?

No, as seen in variable_tracker, $a and $b keep their original values throughout all steps; operations create new variables.

Visual Quiz - 3 Questions

Look at the execution_table at step 4. What is the value of $diff?

A 7

B 13

C 3

D 1

💡 Hint

Check the 'Result' column for step 4 in the execution_table.

At which step does the modulo operation happen?

A Step 5

B Step 7

C Step 6

D Step 8

💡 Hint

Look for the '%' operator in the 'Operation' column in the execution_table.

If $a was 12 instead of 10, what would $mod be at step 7?

A 3

B 1

C 0

D 4

💡 Hint

Calculate 12 % 3 and compare with the modulo result in variable_tracker.

Concept Snapshot

Arithmetic operators in PowerShell:
- Use +, -, *, /, % for add, subtract, multiply, divide, modulo
- Division returns decimal if needed
- Modulo gives remainder
- Variables keep original values unless reassigned
- Use Write-Output to display results

Full Transcript

This lesson shows how PowerShell uses arithmetic operators to calculate with numbers. We start by assigning values to variables $a and $b. Then we add, subtract, multiply, divide, and find the remainder using +, -, *, /, and % operators. Each operation stores its result in a new variable. The division operator returns a decimal number when the division is not exact. The modulo operator returns the remainder after division. The original variables $a and $b remain unchanged. Finally, the results are printed using Write-Output. This step-by-step trace helps beginners see how each variable changes and how the operations work.