Getting started

First, let’s make sure to install the compiler so that we may try all the examples listed in this book.

Once installed, the Crystal compiler should be available as command.

Let’s try it!

Great!

Now, if we want to list all the options given by the compiler, we may run program without any arguments:

More details about using the compiler can be found on the manpage or in our .

```crystal title=”hello_world.cr” puts “Hello World!”

!!! note The main routine is simply the program itself. There’s no need to define a “main” function or something similar.

Next you might want to start with the Introduction Tour to get acquainted with the language.