Hello, World! in Erlang

Example for versions erl 5.7.3

First line notes that this module must be placed in file called prog.erl. Second line exports function main, of arity 0 (takes no parameters). Third line defines the function: all it does is output “Hello, World!”. 

-module(prog).
 
-export([main/0]).
 
main() -> io:format("Hello, World!~n").