Rust Number Square

Rust is a modern, performant programming language designed for systems programming. In this tutorial, we will create a Rust program that prints a number square.

Prerequisites

Before starting, make sure you have the following installed:

• Rust programming language
• Cargo package manager

Getting started

Start by creating a new Rust project using Cargo:

$ cargo new rust-number-square
$ cd rust-number-square

This will create a new Rust project with a default src/main.rs file containing a simple "Hello, world!" program.

We will modify this file to print a number square.

Writing the program

Open src/main.rs in your favorite text editor and replace the existing code with the following:

use std::io;

fn main() {
    println!("Enter a number:");
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();

    let n: i32 = input.trim().parse().unwrap();

    for i in 0..n {
        for j in 0..n {
            print!("{} ", i * n + j);
        }
        println!();
    }
}

This program prompts the user to enter a number, reads the input from the command line, and prints a number square of size n x n.

To run the program, use the following command:

$ cargo run

Example

Here's an example output of the program when run with n = 4:

Enter a number:
4
0 1 2 3 
4 5 6 7 
8 9 10 11 
12 13 14 15 

Conclusion

In this tutorial, we created a Rust program that prints a number square. Rust's performance, memory safety, and expressiveness make it a great choice for systems programming tasks like this one.