Hello World (OCaml/F Sharp)

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Hello World in Ocaml and F# (the program is identical for each). The "let () =" ensures that the return value of the following expression is "()" (the only value of type unit). This detects e.g. missing arguments (it is unecessary for such a simple program but better start with good habits!).

<<hello.ml>>=
let () = print_endline "Hello World!"

This no longer works in F# 2.0 (and possibly earlier versions). Now you would use:

<<hello.ml>>=
let () = printfn "Hello World!";;

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