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Tail Recursive Factorial

Routine for recursively factorize integer numbers

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let factorial n = 
    let rec fac acc n =
        if n > 0 then
            fac (acc * n) (n - 1)
        else
            acc

    fac 1 n

let summary n = 
    let rec sum acc n =
        if n > 0 then
            fac (acc + n) (n - 1)
        else
            acc

    sum 1 n
val factorial : n:int -> int

Full name: Script.factorial
val n : int
val fac : (int -> int -> int)
val acc : int
val summary : n:int -> int

Full name: Script.summary
val sum : ('a -> int -> 'a)
val acc : 'a
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More information

Link:http://fssnip.net/7WC
Posted:1 year ago
Author:Dr. Martin Lockstrom
Tags: #factorization