Functions

Every program we've run so far has consisted of the single main function. It's definition starts with fn followed by the name of the function with some parenthesis (i.e. main()), then the opening and closing {} curly braces that wrap the code that gets executed when the function is called.

We can add more functions to our programs as well using the same approach. For example, here's the definition of a function named "alfa" that prints out "I am alfa":

fn alfa() {
  println!("I am alfa");
}

The function is used by "calling it". The syntax for that is the name of the function followed by parenthesis:

alfa();

Here's a full program where we print I am main inside the main function then call the alfa function which then prints I am alfa

SOURCE CODE

fn main() {
  println!("I am main");
  alfa()
}

fn alfa() {
  println!("I am alfa");
}

CODE RUNNER

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