Arithmetic Operators

Part of the Fundamentals section of Coddy's C# journey — lesson 15 of 69.

Operators are used to perform operations on values.

First we will discuss the most basic arithmetic operators, they may be familiar from math classes.

Operator	Operation	Example
+	Addition	3 + 2 = 5
-	Subtraction	3 - 2 = 1
*	Multiplication	3 * 2 = 6
/	Division	4 / 2 = 2

Let's see usage example,

int a = 3;
int b = 5;
int c = a + b; // c holds 8

When working with decimal numbers in C#, we use the double data type, which can store numbers with decimal points.

The same arithmetic operators (+, -, *, /) work with doubles just like they do with integers:

double x = 3.3;
double y = 4.1;
double z = x + y; // z holds 7.4

Challenge

Beginner

Write a code that initializes two variables, a and b, with the values 5.2 and 2.6 (respectively).

After that, initialize another variable c that will hold the result of a / b.

Cheat sheet

Arithmetic operators perform mathematical operations on values:

Operator	Operation	Example
+	Addition	3 + 2 = 5
-	Subtraction	3 - 2 = 1
*	Multiplication	3 * 2 = 6
/	Division	4 / 2 = 2

Using arithmetic operators with integers:

int a = 3;
int b = 5;
int c = a + b; // c holds 8

Using arithmetic operators with decimal numbers (double):

double x = 3.3;
double y = 4.1;
double z = x + y; // z holds 7.4

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // Type your code below
        
        
        // Don't change the line below
        Console.WriteLine("a = " + a + ", b = " + b + ", c = " + c);
    }
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

C#Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic OperatorsModulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts

7Basic IO

Basic Output String Interpolation Reading Input Parse Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Optional Parameters Recap - Validation Function Void Methods

13Iterating Over Collections

Using For Loop Foreach Loop Common Array Operations

2Variables Part 1

Numbers Char String Boolean Type Declaration

5Operators Part 2

Comparison Operators Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3

8Calculator App

Welcome Message Getting Numbers

Basic Operations

Formatted Output

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Edit Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Var Constants Naming Conventions Recap - Initialize Variables Type Casting

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop While Loop Do While Loop Break Continue Nested Loop Infinite Loop Recap - Dynamic Input

12String Operations

String Methods Part 1 String Methods Part 2 String Formatting