Arithmetic operators in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell arithmetic operation?

Consider the following PowerShell command:

$result = 5 + 3 * 2
$result

What is the output?

PowerShell

$result = 5 + 3 * 2
$result

A 11

B Error

C 10

D 16

💡 Hint

Remember the order of operations: multiplication happens before addition.

In PowerShell, multiplication (*) has higher precedence than addition (+). So 3 * 2 = 6, then 5 + 6 = 11.

💻 Command Output

intermediate

What is the output of this division and modulus operation?

Look at this PowerShell code:

$a = 17
$b = 4
$div = [math]::Floor($a / $b)
$mod = $a % $b
"Division: $div, Modulus: $mod"

What will be printed?

PowerShell

$a = 17
$b = 4
$div = [math]::Floor($a / $b)
$mod = $a % $b
"Division: $div, Modulus: $mod"

A Division: 5, Modulus: 1

B Division: 4.25, Modulus: 1

C Division: 4, Modulus: 1

D Division: 4, Modulus: 0

💡 Hint

Division result is floored to get integer division.

17 divided by 4 is 4.25. Floor rounds down to 4. The modulus operator (%) gives the remainder 1.

📝 Syntax

advanced

Which option correctly increments a variable by 1 in PowerShell?

You want to increase the value of variable $count by 1. Which of these commands will do it correctly?

A ++$count

B $count++

C $count += 1

D $count = $count + 1

💡 Hint

PowerShell does not support ++ or -- operators.

PowerShell does not support the ++ or -- operators. To increment, use '+=' or assign the sum explicitly.

💻 Command Output

advanced

What is the output of this PowerShell expression with mixed operators?

Evaluate this PowerShell expression:

$x = 10
$y = 3
$result = $x / $y * 2 - 1
$result

What is the output?

PowerShell

$x = 10
$y = 3
$result = $x / $y * 2 - 1
$result

A 5.66666666666667

B 5.66666666666666

C 5.6666666666667

D 5.66666666666668

💡 Hint

Division and multiplication have the same precedence and are evaluated left to right.

10 / 3 = 3.33333333333333, times 2 = 6.66666666666666, minus 1 = 5.66666666666667 (rounded).

🔧 Debug

expert

Why does this PowerShell script produce an error?

This script is intended to calculate the remainder of 15 divided by 4:

$a = 15
$b = 4
$remainder = $a mod $b
Write-Output $remainder

Why does it fail?

PowerShell

$a = 15
$b = 4
$remainder = $a mod $b
Write-Output $remainder

A Variables $a and $b are not initialized properly.

B 'mod' is not a valid operator in PowerShell; use '%' instead.

C Write-Output cannot output variables directly.

D PowerShell requires parentheses around arithmetic expressions.

💡 Hint

Check the operator used for modulus in PowerShell.

PowerShell uses '%' for modulus, not 'mod'. Using 'mod' causes a syntax error.