Arithmetic operators in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are arithmetic operators in C#?

Arithmetic operators are symbols used to perform basic math operations like addition (+), subtraction (-), multiplication (*), division (/), and modulus (%).

beginner

What does the modulus operator (%) do?

The modulus operator (%) gives the remainder after dividing one number by another. For example, 7 % 3 equals 1 because 7 divided by 3 leaves a remainder of 1.

beginner

How does integer division behave in C#?

When you divide two integers, C# returns the whole number part only, dropping any decimal. For example, 7 / 3 equals 2, not 2.333.

intermediate

What is the result of this C# expression: 5 + 3 * 2?

The result is 11 because multiplication (*) has higher priority than addition (+). So, 3 * 2 = 6, then 5 + 6 = 11.

beginner

Explain the difference between / and % operators in C#.

The / operator divides two numbers and returns the quotient (the result of division). The % operator returns the remainder left after division. For example, 10 / 3 is 3, and 10 % 3 is 1.

What is the output of: int result = 10 / 4; Console.WriteLine(result); ?

A 2

B 2.5

C 3

D 4

Integer division drops the decimal part, so 10 / 4 equals 2.

Which operator gives the remainder of a division in C#?

A +

B -

C /

D %

The % operator returns the remainder after division.

What is the result of: 8 + 2 * 5?

A 20

B 18

C 50

D 30

Multiplication happens before addition: 2 * 5 = 10, then 8 + 10 = 18.

Which operator is used for multiplication in C#?

A *

B /

C +

D -

The * symbol is used for multiplication.

What will be the output of: Console.WriteLine(15 % 4); ?

A 1

B 4

C 3

D 15

15 divided by 4 leaves a remainder of 3, so 15 % 4 is 3.

Describe the main arithmetic operators in C# and give a simple example for each.

Think about +, -, *, /, and % symbols.

Explain how operator precedence affects the result of arithmetic expressions in C#.

Consider how 5 + 3 * 2 is calculated.