How to Use the Rust Compiler

To use the Rust Compiler, follow these steps:

  1. In the code editor, write your Rust code.
  2. Click the "RUN" button to compile and run your code.
  3. The output will be displayed in the console below the code editor.

Taking Inputs

In Rust, you can take inputs from the user in various ways. Here are some examples:

String Input

use std::io::{self, Read};

fn main() {
    let mut input = String::new();
    io::stdin().read_to_string(&mut input).unwrap();
    println!("You entered: {}", input);

Number Input

use std::io;

fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let num: i32 = input.trim().parse().unwrap();
    println!("You entered: {}", num);

Importing Libraries

Rust has a rich set of built-in libraries that can be used in your programs. Here are some examples:

Using the Math Library

fn main() {
    let result = f64::sqrt(25.0);
    println!("Square root of 25 is {}", result);

Using the Vec Class

fn main() {
    let arr = vec![1, 2, 3, 4, 5];
    println!("Array: {:?}", arr);

Syntax 101

Rust is a multi-paradigm programming language focused on performance and safety, especially safe concurrency. Here's a primer on the major syntax basics of Rust:


Variables in Rust are immutable by default. You can make them mutable with the mut keyword.

let name = "John Doe"; // Immutable variable
let mut age = 25; // Mutable variable

Control Structures

Rust includes control structures such as if, else, for, while, and match.

// If-Else
if age > 18 {
} else {

// For loop
for i in 0..5 {
    println!("{}", i);

// Match
match day {
    "Monday" => println!("Start of the work week"),
    "Friday" => println!("End of the work week"),
    _ => println!("Midweek"),


Functions in Rust are defined with the fn keyword.

fn greet(name: &str) {
    println!("Hello, {}", name);

greet("John Doe"); // Calls the function with "John Doe" as the argument

Rust Online Test

A Rust online test is an effective way to assess an individual's Rust programming skills, especially in the context of systems programming. These tests typically include a mix of theoretical questions and practical coding challenges. By attempting these tests, candidates can demonstrate their understanding of Rust concepts, their problem-solving abilities, and their proficiency in writing efficient code. Rust online tests are commonly used in technical interviews, coding bootcamps, and online learning platforms to gauge a learner's understanding and proficiency in Rust.