what-is-a-rust-hello-world-program

What is a Rust "Hello, World!" program?

In Rust, a simple "Hello, World!" program is:

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

This program contains a single function, main(), which is the entry point for the program. The function body is enclosed in curly braces {} and contains a single statement:

println!("Hello, World!");

This statement prints the text "Hello, World!" to the console using Rust's standard library macro println!(). The println!() macro is a convenient way to print formatted text to the console, and in this case, it simply prints the string literal "Hello, World!".

When you run this program, you should see the text "Hello, World!" printed to the console.

To create this program, the typical way is to use the Rust cargo package manager, which can create an example project:

cargo new hello
cd hello

Then edit the src/main.rs file, which is automatically created with the "hello world" code above. Change it as you wish.

To run the program:

cargo run

You should see the output:

Hello, World!