Rust Hello

Synopsis:

This page demonstrates using Visual Studio Code to build and run a simple Rust "Hello World" program, showing its build process and launch file. The goal is to get you started quickly.

Source Code
The code below is a fragment from the Bits Repository. Download the repo containing all Bits code by opening the "Code" dropdown on that page.
```
// HelloWorld::main.rs
fn main() {
  println!("Hello Rust world");
}          
```
Output
This is the output from the Rust source code above, running in Visual Studio Code. An embedded terminal window displays the output. VS Code runs on Windows, Linux, and macOS.
```
C:\github\JimFawcett\Bits\Rust\rust_hello_world
> cargo run -q

Hello Rust world

C:\github\JimFawcett\Bits\Rust\rust_hello_world
>
```
Build
Building a Rust project with Cargo uses two commands: cargo build builds the project, and cargo run builds and runs it. Run Cargo from the project directory - the one holding Cargo.toml and a "src" directory that contains all the project files. The Rust RLS plug-in lets you build from the VS Code menu, but I find building from the command line in VS Code's embedded terminal simpler and quicker.
```
C:\github\JimFawcett\Bits\Rust\rust_hello_world
> cargo build
Compiling rust_hello_world v0.1.0 (C:\github\JimFawcett\Bits\Rust\rust_hello_world)
Finished dev [unoptimized + debuginfo] target(s) in 0.31s
C:\github\JimFawcett\Bits\Rust\rust_hello_world
      
```

Create Project

The terminal session below shows how to create a Rust project using the Cargo tool (part of the Rust installation). See tooling information here: Bits_Tooling.

C:\github\JimFawcett\test
> cargo new --bin rust_hello_world
  Created binary (application) `rust_hello_world` package
C:\github\JimFawcett\test
> cd rust_hello_world
C:\github\JimFawcett\test\rust_hello_world
> dir

Directory: C:\github\JimFawcett\test\rust_hello_world

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----         2/23/2023   3:11 PM                src
-a----         2/23/2023   3:11 PM            185 Cargo.toml

C:\github\JimFawcett\test\rust_hello_world
> type Cargo.toml
[package]
name = "rust_hello_world"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
C:\github\JimFawcett\test\rust_hello_world
>

VS Code View The code for this demo lives at github.com/JimFawcett/Bits. Click the Code dropdown to clone the repository of all demo code to your local drive. From there, opening any example in any language in VS Code is easy. Here, we do that for Cpp\Cpp_Hello. Figure 1. VS Code IDE Figure 2. Launch.JSON Figure 3. Rust Plugins

References

Reference	Description
Rust Story	E-book with seven chapters covering most of intermediate Rust
Rust Bites	Relatively short feature discussions
Bits Tooling	Tool chains, VS Code

You will find many additional references in the Rust Story and Rust Bites.

RustBites: Hello

hello world program

Synopsis: