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F# Program Structure is a Functional Programming language. In F#, functions work like data types. You can declare and use a function in the same way as any other variable.

In general, an F# application does not have any specific entry point. The compiler executes all top-level statements in the file from top to bottom.

However, to follow the procedural programming style, many applications keep a single top-level statement that calls the main loop.

The following code shows a simple F# program −

open System
(* This is a multi-line comment *)
// This is a single-line comment

let sign num =
   if num > 0 then "positive"
   elif num < 0 then "negative"
   else "zero"

let main() =
   Console.WriteLine("sign 5: {0}", (sign 5))

main()

When you compile and execute the program, it yields the following output −

sign 5: positive

Please note that −

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