Created
April 11, 2015 17:17
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module type Number = sig | |
type t | |
val (+) : t -> t -> t | |
val (/) : t -> t -> t | |
val of_int : int -> t | |
val init : unit -> t | |
end | |
module Make = functor | |
(N : Number) -> | |
struct | |
let sum arr = | |
let open N in | |
let r = ref @@ init () in | |
for i = 0 to (Array.length arr) - 1 do | |
r := !r + arr.(i) | |
done; | |
!r | |
let ave arr = | |
let s = sum arr in | |
N.(/) s (N.of_int @@ Array.length arr) | |
end | |
module Float = struct | |
type t = float | |
let (+) x y = x +. y | |
let (/) x y = x /. y | |
let init () = 0.0 | |
let of_int x = float x | |
end | |
module FCal = Make(Float) | |
let main () = | |
let arr = [|2.1; 2.2; 2.3|] | |
in | |
Printf.printf "%f\n" @@ FCal.ave arr |
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