Rust Hello World

To get started with Rust and create a "Hello, World!" program, follow these steps:

Step 1: Install Rust

First, you need to install Rust. The recommended way to do this is by using rustup, a tool for managing Rust versions and associated tools:

Open your terminal.
Run the following command:

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

Follow the on-screen instructions to complete the installation. After installation, make sure your PATH environment variable is updated. You can do this by restarting your terminal or running the following command:

sh
source $HOME/.cargo/env

Step 2: Create a New Rust Project

Create a new directory for your project and navigate into it. Then, use cargo (Rust's package manager and build system) to create a new project:

sh
cargo new hello_world
cd hello_world

This creates a new directory named hello_world with the following structure:

css
hello_world/
├── Cargo.toml
└── src
    └── main.rs

Step 3: Write the "Hello, World!" Program

Open the src/main.rs file in your preferred text editor and add the following code:

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

Step 4: Build and Run the Program

To build and run your program, use the following cargo commands:

sh
cargo build      # This compiles your program
cargo run        # This compiles and runs your program

When you run cargo run, you should see the output:


Hello, world!

Full Example

Here's a complete example showing the contents of the main.rs file:

rust
// src/main.rs

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

Explanation

fn main() { ... }: This defines the main function, which is the entry point of the program.
println!("Hello, world!");: This prints "Hello, world!" to the console. The println! macro is used for printing text.

Additional Tips

Documentation: Rust has excellent documentation. You can refer to the Rust Book for a comprehensive guide.
Cargo: Cargo is a powerful tool that manages Rust projects, dependencies, and builds. You can learn more about it in the Cargo Book.
Community: The Rust community is very welcoming. You can find help and resources on the Rust Users Forum, Rust subreddit, and Rust Discord.

That's it! You've successfully written and run your first Rust program.

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