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# Hello World
This is the source code of the traditional Hello World program.
```rust,editable
// This is a comment, and is ignored by the compiler
// You can test this code by clicking the "Run" button over there ->
// or if you 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() {
// Statements here are executed when the compiled binary is called
// Print text to the console
println!("Hello World!");
}
```
`println!` is a [*macro*][macros] that prints text to the
console.
A binary can be generated using the Rust compiler: `rustc`.
```bash
$ rustc hello.rs
```
`rustc` will produce a `hello` binary that can be executed.
```bash
$ ./hello
Hello World!
```
### Activity
Click 'Run' above to see the expected output. Next, add a new
line with a second `println!` macro so that the output
shows:
```text
Hello World!
I'm a Rustacean!
```
[macros]: macros.md
|
