Arithmetic operators in Rust

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 game or test.

Updating a counter when something happens multiple times.

Converting units, like inches to centimeters.

Splitting a bill evenly among friends.

Syntax

Rust

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

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

Division between integers will give an integer result (rounded down).

Examples

Adds two numbers.

Rust

let a = 10;
let b = 3;
let sum = a + b;  // 13

Subtracts b from a.

Rust

let a = 10;
let b = 3;
let difference = a - b;  // 7

Multiplies a and b.

Rust

let a = 10;
let b = 3;
let product = a * b;  // 30

Divides a by b and finds the remainder.

Rust

let a = 10;
let b = 3;
let quotient = a / b;  // 3
let remainder = a % b;  // 1

Sample Program

This program shows how to use all the basic arithmetic operators with two numbers and prints the results.

Rust

fn main() {
    let a = 15;
    let b = 4;

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

    println!("Sum: {}", sum);
    println!("Difference: {}", difference);
    println!("Product: {}", product);
    println!("Quotient: {}", quotient);
    println!("Remainder: {}", remainder);
}

Important Notes

Remember that dividing integers truncates the decimal part.

Use floating-point numbers (like f32 or f64) if you want decimal results.

Summary

Arithmetic operators let you do basic math in Rust.

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

Integer division drops decimals; use floats for precise division.