在函数内部调用函数后，如何在F＃中重复该函数？

Question

I have a game where you can do certain actions, then after the action is done I have a list of actions you can do again but after it's been completed once the program ends, I thought because it's a recursive function it will keep going.

This is not part of my game but just a demonstration, this program asks for a string once then finishes. Shouldn't it keep asking for a string, and how can I make it do that? I also tried calling back to the recursive function inside the f1 function but of course f1 does not know it exists.

open System

let f1 x =
    printfn "Hello, %s" x

let rec f2 =
    let x = Console.ReadLine()
    f1 x

Console.Read() |> ignore

Answer 1

As noted in the comments, you define f2 as a value, not as a function. This has been discussed on StackOverflow before and there is a good question and answer that covers this.

The other problem is that you probably want to call f2 from f1 (to continue looping) as well as call f1 from f2 . To do this, you can define the functions as mutually recursive using let rec .. and syntax:

let rec f1 x =
    printfn "Hello, %s" x
    f2 ()

and f2 () =
    let x = Console.ReadLine()
    f1 x