RustBook

• Getting Started
  • Chapter 01: Installation
    • Update
    • Documentation
  • Chapter 02: Hello, World!
    • Note
  • Chapter 03: Hello, Cargo!
    • New project with Cargo
    • Building with Cargo
    • Running a cargo
    • Checking a cargo
    • Releasing a cargo
• Programming a guessing game

Getting Started

Chapter 01: Installation

Recommendation is to use rustup using the command:

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

To confirm it's installed:

  rustup --version

rustup 1.26.0 (5af9b9484 2023-04-05)

Update

To update rustup and please do regularly

  rustup update

(

stable-x86_64-unknown-linux-gnu unchanged - rustc 1.76.0 (07dca489a 2024-02-04)

Documentation

rustup comes with documentation, just type

  rustup doc

and the browser will open a page with links toward lots of docs.

Chapter 02: Hello, World!

Basically done in 3 steps:

• Edit the rs file
• Compile using rustc
• Call the executable

Work folder is Projects/01_HelloWorld, where we create the file main.rs

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

To execute this program:

  cd Projects/01_HelloWorld/
  rustc main.rs
  ./main

Hello, World!

The program works, I'm now done.

Note

All rust program starts by calling the function main. Functions with ! appended to their name, like println!, are macros.

Chapter 03: Hello, Cargo!

Make sure Cargo is installed

  cargo --version

cargo 1.76.0 (c84b36747 2024-01-18)

New project with Cargo

  cargo new Projects/hello_cargo
  tree Projects/hello_cargo

Projects/hello_cargo
├── Cargo.toml
└── src
    └── main.rs

2 directories, 2 files

Cargo creates:

• a directory with the project name given,
• and a project with the same name

The Cargo configuration file Cargo.toml in the root folder and the projcet code in the src/ directiory is what makes it a Rust project.

Building with Cargo

From the root folder, run

  cargo build

This will create a Cargo.lock file in the root directory, and an executable in src/target/debug/hello_cargo. Which means you can display the text "hello, World!" by calling directly the file

  ./target/debug/hello_cargo

Hello, world!

Running a cargo

You can both build and run the program with

  cargo run

Hello, world!

Checking a cargo

Cargo can check if the program can compile. It doesn't execute it.

  cargo check

    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[ Babel evaluation exited with code 0 ]

Releasing a cargo

To build a cargo with an optimised build, run

  cargo build --release
  tree

.
├── Cargo.lock
├── Cargo.toml
├── src
│   └── main.rs
└── target
    ├── CACHEDIR.TAG
    └── release
        ├── build
        ├── deps
        │   ├── hello_cargo-ac6d8d77e18d4d6b
        │   └── hello_cargo-ac6d8d77e18d4d6b.d
        ├── examples
        ├── hello_cargo
        ├── hello_cargo.d
        └── incremental

8 directories, 8 files

The build results are in the folder target/release/ now.

Programming a guessing game