Learning rust

I bought The Rust Programming Language in ePub format a long time ago.

It has been on my radar for a few years now, but I never had the time to learn it.

Install

$ curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh

The recommended method did not work for me.

The debian way did work:

$ sudo apt install rust-all cargo
...
$ rustc --version
rustc 1.85.0 (4d91de4e4 2025-02-17) (built from a source tarball)

Chapter 1.2

The famous Hello, World! program:

// See: https://doc.rust-lang.org/stable/book/ch01-02-hello-world.html

fn main() {
    println!("Hello, world!");
}

Chapter 1.3

Hello, World! the cargo way:

cees@dev01:~/prj/hello-cargo$ cargo build
   Compiling hello-cargo v0.1.0 (/home/cees/prj/hello-cargo)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
cees@dev01:~/prj/hello-cargo$ ./target/debug/hello-cargo 
Hello, world!
cees@dev01:~/prj/hello-cargo$ cargo run
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.00s
     Running `target/debug/hello-cargo`
Hello, world!

Chapter 2: Guessing game

See: The Rust Programming Language: Chapter 2

use std::cmp::Ordering;
use std::io;

use rand::Rng;

fn main() {
    println!("Guess the number!");

    let secret_number = rand::rng().random_range(1..=100);
    // println!("The secret number is: {secret_number}");

    loop {
        println!("Please input your guess.");

        let mut guess = String::new();

        io::stdin()
            .read_line(&mut guess)
            .expect("Failed to read line");

        let guess: u32 = match guess.trim().parse() {
            Ok(num) => num,
            Err(_) => continue,
        };

        println!("You guessed: {guess}");

        match guess.cmp(&secret_number) {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal => {
                println!("You win!");
                break;
            }
        }
    }
}

N.B. the syntax of rand::Rng has changed.

cees@dev01:~/prj/guessing-game$ cargo run
   Compiling guessing-game v0.1.0 (/home/cees/prj/guessing-game)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
     Running `target/debug/guessing-game`
Guess the number!
Please input your guess.
50
You guessed: 50
Too small!
Please input your guess.
75
You guessed: 75
Too big!
Please input your guess.
63
You guessed: 63
Too big!
Please input your guess.
57
You guessed: 57
You win!