Hello World in Rust

Build and Run

In our main.rs, add the following code:

// main.rs

fn main() {
  println!("Hello,世界,こんにちは,안녕하세요")
}

Hello,世界,こんにちは,안녕하세요

we can run our application by typing:

Hello,世界,こんにちは,안녕하세요

Using cargo Command

Generating a new project

To start, we’ll use Cargo to make a new project for us. For example,

Created binary (application) `hello-rust` package

This will generate a new directory called hello-rust with the following files:

hello-rust
|- Cargo.toml #is the manifest file for Rust.
|- src
  |- main.rs #is where we’ll write our application code.

Run this program

We can run this program by moving into the new directory that we made and running this in our terminal:

Compiling hello-rust v0.1.0 (/home/rust/hello-rust)
    Finished dev [unoptimized + debuginfo] target(s) in 2.68s
     Running `target/debug/hello-rust`
Hello, world!

Hello fellow Rustaceans!

A small Rust application. For example,

use ferris_says::say; // from the previous step
use std::io::{stdout, BufWriter};

fn main() {
    let stdout = stdout();
    let message = String::from("Hello fellow Rustaceans!");
    let width = message.chars().count();

    let mut writer = BufWriter::new(stdout.lock());
    say(message.as_bytes(), width, &mut writer).unwrap();
}

Run this program:

 __________________________
< Hello fellow Rustaceans! >
 --------------------------
        \
         \
            _~^~^~_
        \) /  o o  \ (/
          '_   -   _'
          / '-----' \