F# program to check Positive or Negative Number

Program

open System
let checkPosNeg number = 
                        if(number = 0) then Console.WriteLine("Given number is Zero")
                        elif(number > 0) then Console.WriteLine("Given number is Positive")
                        else Console.WriteLine("Given number is Negative")
Console.Write("Enter the number to check whether it is positive or negative:\t")
let number = Int32.Parse(Console.ReadLine())
checkPosNeg number

Output 1

Enter the number to check whether it is positive or negative:   245
Given number is Positive

Output 2

Enter the number to check whether it is positive or negative:   -543
Given number is Negative

Output 3

Enter the number to check whether it is positive or negative:   0
Given number is Zero