Edx - F# - Homework Conditionals

// Learn more about F# at http://fsharp.org
// See the 'F# Tutorial' project for more help.

// The code for both koan and problem are included in this file
// Indented code available at

open System

[<EntryPoint>]
let main argv =
    // Koan

//    let dosomethingrandom x =
//        if x == 0 then Console.WriteLine(1)
//        else dosomethingrandom (x - 1) * x

    let rec dosomethingrandom x =
        if x = 0 then 1
        else x * dosomethingrandom (x - 1)

    let calc0 = dosomethingrandom 0
    let calc12 = dosomethingrandom 12
    printfn "%d %d" calc0 calc12

    // Problem
    printf "Enter name "
    let name = Console.ReadLine()
    printf "Enter age "
    let isvalid, age = Int32.TryParse(Console.ReadLine())
    if isvalid then
        let message = if age >= 20 then name + " is not a teenager"
                      elif age < 13 then
                        name + " is a kid or child"
                      else
                        name + " is a teenager"
        printfn "%s" message
    Console.ReadKey()
    0 // return an integer exit code