Hello world

Where else to start than with the classic "Hello world" example.

Before we start, make sure you have the Ruda virtual machine installed. You can find instructions on how to do that here.

When you create a new project, Ruda will automatically create a main.rd file in the src directory. This is where you will write your code.

Open the main.rd file. You should see the following code:

import "#io"

fun main() {
    io.println("Hello world")
}

Let's go through this line by line.

import "#io"

This line imports the io module from the standard library. This module allows you to read and write to the console.

fun main() {

This line defines a function called main. This is the entry point of the program. The program will start executing from here.

    io.println("Hello world")

This line calls the println function from the io module. This function prints the given string to the console.

}

This line ends the main function.

Running the program

To run the program, run the following command:

ruda run

This will build and run the program. If you did everything correctly, you should see the following output:

Hello world

Congratulations! You have successfully written and run your first Ruda program.