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Arithmetic Operators

Part of the Fundamentals section of Coddy's Java journey. Lesson 15 of 73.

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 Java, 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 = 3.5;
double y = 4.25;
double z = x + y; // z holds 7.75

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.

Try it yourself

public class Main {
    public static void main(String[] args) {
        // Type your code below
        
        
        // Don't change the line below
        System.out.println("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

Java Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic OperatorsModulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts Comparison Operators String Comparison

7Basic IO

System.out Methods Formatting Output Scanner Class Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Method Overloading Recap - Sigma Function Recap - Validation Function Void Methods

13String Operations

String Methods Part 1 String Methods Part 2 String Formatting String Comparison

2Variables Part 1

Numbers String Boolean char Type Declaration

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Logical Operators Part 4

8Calculator App

Welcome Message Getting Numbers

Project lesson

Basic Operations

Project lesson

Formatted Output

Project lesson

11Arrays Basics

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

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Constants Naming Conventions Recap - Initialize Variables Type Casting Part 1 Type Casting Part 2

6Decision Making

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

9Loops

For Loop Part 1 While Loop Do While Loop Break Continue For Loop Part 2 Nested Loop Infinite Loop Recap - Dynamic Input

12Iterating Over Arrays

Using For Loop Enhanced For Loop Common Array Operations

Practice on your own: Online Java compiler