Hello World with Cargo

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• Cargo is the package management, dependency management, and build system of Rust.
• cargo new hello-world creates a new folder called hello-world
• With a file called Cargo.toml
• A folder called src and a file src/main.rs with the hello world code.
• cargo run will comple the code and run it.

cargo new hello-world
cd hello-world

examples/intro/hello-world/src/main.rs

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

examples/intro/hello-world/Cargo.toml

[package]
name = "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]

• It will also create a git repository out of this folder.

$ cargo run
   Compiling hello-world v0.1.0 (/home/gabor/work/slides/rust/examples/hello-world)
    Finished dev [unoptimized + debuginfo] target(s) in 0.34s
     Running `target/debug/hello-world`
Hello, world!

It also created a file called Cargo.lock and a folder called target.

• Cargo.lock is used to fix the versions of all the dependencies of the project. We have none so far.
• target contains the compiled file and all the temporay files that Rust needed for the compilation.