Rust by Example

1 Hello World

This is the source code of the traditional Hello World program.

// This is a comment, and will be ignored by the compiler // You can test this code by clicking the "Run" button over there -> // or if prefer to use your keyboard, you can use the "Ctrl + Enter" shortcut // This code is editable, feel free to hack it! // You can always return to the original code by clicking the "Reset" button -> // This is the main function fn main() { // The statements here will be executed when the compiled binary is called // Print text to the console println!("Hello World!"); }

println! is a macro (we'll cover them later) that prints text to the console.

A binary can be generated using the Rust compiler: rustc.

$ rustc

rustc will produce a hello binary that can be executed.

$ ./hello
Hello World!