Declaring Variables

Declaring variables in programming is a fundamental concept that allows you to store and manipulate data. Variables are used to store values that can be accessed and modified throughout the program.

In Rust, variables are declared using the let keyword followed by the variable name and an optional type annotation.

In Rust, variables are immutable by default. This means that once a value is bound to a variable, it cannot be changed. This is a key feature of Rust that helps ensure safety and prevent bugs by avoiding unexpected changes to values.

Your task

In this challenge, you will declare and use immutable variables in Rust. You will be given a function where you need to declare variables and use them to perform specific operations. The goal is to get comfortable with the concept of immutability and understand how to use immutable variables effectively.

Your task is to define two immutable variables inside the function using the let keyword:

width with a value of 10
height with a value of 5

Then, calculate the area of a rectangle using the formula area = width * height and return the calculated area.

Requirements

Declare two immutable variables, width and height, and assign them values.
Calculate the area of the rectangle using the formula width * height.
Return the calculated area.

Hints

Use the let keyword to declare variables.
Remember that variables declared with let are immutable by default.
Use multiplication * to calculate the area.

Editor not available on Mobile!

In order to solve the challenge, please visit this page on a desktop computer.

Solutions

Kirill Yakimenkov

TiGrib

a minute ago

3.20ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Hannes Küttner

hanneskuettner

2 minutes ago

2.81ms

92.90kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    
    return width * height;
}

CountJung

21 minutes ago

3.03ms

93.62kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height= 5;
    let area=width*height;
    area
}

Ryumin

RiskyRomero

37 minutes ago

3.03ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Adi

adityaarakeri

41 minutes ago

3.00ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Gigih Aji Ibrahim

bungcip

2 hours ago

2.80ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Zhai Can

bczhc

2 hours ago

2.92ms

93.63kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    area
}

至尊宝

shankun

2 hours ago

3.15ms

93.63kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    let width = 10;
    let height = 5;
    // Calculate the area of the rectangle
    let area = width * height;
    // Return the calculated area
    area
}

Dylan Park

dylan-park

2 hours ago

2.81ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

pagyeman

2 hours ago

2.86ms

93.63kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    
    let height = 5;
    let area = width * height;
    area
}

Huida

3 hours ago

2.97ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

lishigushi

3 hours ago

2.90ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Paul Apicerno

papicerno

5 hours ago

2.77ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

LordChildConsumer

5 hours ago

2.81ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Park Seung-Keun

dadak797

5 hours ago

3.14ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Vinny Keeler

ShieldedAsh

5 hours ago

3.04ms

93.89kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    return area;
}

Joel Vicente Filho

kyhou

6 hours ago

2.72ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Carlos Arias

carlos-quantexai

6 hours ago

2.91ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Tukan van der Borgh

tukantje

6 hours ago

2.80ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Kevin Corcoran

kevin-corcoran

7 hours ago

3.08ms

92.90kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    return width * height;
}

HECKYEAHH

7 hours ago

3.05ms

93.89kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    return area;
}

Tiago Silva

tiagombsilva

9 hours ago

2.88ms

92.87kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    return width * height
}

Conrad Mo

conrad-mo

9 hours ago

2.75ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Nicolás Caracci

hilias

9 hours ago

2.75ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Tim Sekiguchi

tsekiguchi

10 hours ago

2.90ms

93.85kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    return area
}

Kyle Geppert

krgeppert

10 hours ago

2.84ms

92.67kb

pub fn calculate_area() -> u32 {
    let width = 10u32;
    let height = 5u32;
    width * height
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
}

Alex Kelleher

haak

11 hours ago

2.99ms

92.87kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    return width * height
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
}

Jason Green

jaswgreen

11 hours ago

2.84ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width  = 10;
    let height = 5;
    width * height
}

Nika Shamiladze

asyncfinkd

11 hours ago

2.87ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    
    width * height
}

Trym Skaar

trym

11 hours ago

2.82ms

92.73kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    return width * height;
}

Gareth Andrew Lloyd

Ignition

11 hours ago

2.76ms

92.46kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width*height
}

JD

arukanoido

11 hours ago

2.74ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Pascal Dietrich

Cameo007

11 hours ago

2.78ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Quentin Cabanes

qcabanes-hobby

12 hours ago

2.84ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

Danny Yoo

dyoo

12 hours ago

2.75ms

92.64kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
}

Jay Knight

jay-knight

12 hours ago

3.06ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    width * height
}

st01011

12 hours ago

2.92ms

93.68kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    let area = width * height;
    return area
}

Laurențiu STOLERIU

LaurentiuStoleriu

12 hours ago

2.98ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width*height
}

bmelancon

13 hours ago

2.74ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

CarrotTarrot

13 hours ago

2.75ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Christian Franzl

wischi-chr

13 hours ago

3.07ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Bo Johnson

bojohnson5

13 hours ago

2.83ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Katz

Katx510

14 hours ago

2.83ms

92.47kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    
    width * height
}

Haolaaa

14 hours ago

2.78ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width*height
}

Dominik P

ddominikp

14 hours ago

3.12ms

93.66kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10u32;
    let height = 5u32;
    let area = width * height;
    area
}

Juraj Zvolensky

jzvolensky

15 hours ago

3.12ms

93.86kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    return area
}

Zhongjin Lu

XiaoPengYouCode

15 hours ago

2.94ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Ilshat Safiullin

semurgx

15 hours ago

2.67ms

92.64kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    width * height
}

Ussef Zanna

ussefzanna

15 hours ago

3.13ms

93.89kb

pub fn calculate_area() -> u32 {
    // TODO: Implement the function here
    // Declare width and height as immutable variables
    // Calculate the area of the rectangle
    // Return the calculated area
    let width = 10;
    let height = 5;
    let area = width * height;
    return area;
}

Niko

nicolodonvito

15 hours ago

3.07ms

93.68kb

pub fn calculate_area() -> u32 {
    let width = 10;
    let height = 5;
    let area = width*height;
    return area
}