Arithmetic operators in Kotlin

Introduction

Arithmetic operators help you do math with numbers in your program. They let you add, subtract, multiply, and divide values easily.

Calculating the total price of items in a shopping cart.

Finding the average score of a student.

Increasing or decreasing a counter in a game.

Converting units, like kilometers to miles.

Splitting a bill evenly among friends.

Syntax

Kotlin

val sum = a + b
val difference = a - b
val product = a * b
val quotient = a / b
val remainder = a % b

Use + for addition, - for subtraction, * for multiplication, / for division, and % for remainder (modulus).

Make sure the variables used are numbers like Int or Double.

Examples

Adds 10 and 3, then prints 13.

Kotlin

val a = 10
val b = 3
val sum = a + b
println(sum)

Finds the remainder when 10 is divided by 3, which is 1.

Kotlin

val a = 10
val b = 3
val remainder = a % b
println(remainder)

Multiplies two decimal numbers and prints 11.0.

Kotlin

val a = 5.5
val b = 2.0
val product = a * b
println(product)

Sample Program

This program shows all basic arithmetic operations with two numbers and prints the results.

Kotlin

fun main() {
    val x = 15
    val y = 4

    val sum = x + y
    val difference = x - y
    val product = x * y
    val quotient = x / y
    val remainder = x % y

    println("Sum: $sum")
    println("Difference: $difference")
    println("Product: $product")
    println("Quotient: $quotient")
    println("Remainder: $remainder")
}

Important Notes

Division between two integers returns an integer result (it cuts off decimals).

Use Double or Float types if you want decimal results from division.

The remainder operator (%) gives the leftover part after division.

Summary

Arithmetic operators let you do basic math in Kotlin.

Use +, -, *, /, and % for addition, subtraction, multiplication, division, and remainder.

Integer division drops decimals; use floating-point numbers for precise division.